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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressesAddressTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Addresses, Address Type [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NotesAndOtherExplanatoryInformationAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Notes and other explanatory information [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_EquityAttributableToOwnersOfParent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equity attributable to owners of parent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_EquityAttributableToOwnersOfParent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Equity attributable to Shareholders of the Company</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_EquityAttributableToOwnersOfParent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Equity attributable to Shareholders of the Company</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfIncomeTaxExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of income tax [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfIncomeTaxExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Income Tax Expenses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Investing activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash flows from (used in) investing activities [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ContributionsToPlanNetDefinedBenefitLiabilityAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Decrease (increase) in net defined benefit liability (asset) resulting from contributions to plan</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ContributionsToPlanNetDefinedBenefitLiabilityAsset_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel">Total increase (decrease) in net defined benefit liability (asset) resulting from contributions to plan</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ContributionsToPlanNetDefinedBenefitLiabilityAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Payment during the period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ContributionsToPlanNetDefinedBenefitLiabilityAsset_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Payment during the period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_PlantAndMachineryMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Plant and Machinery</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_PlantAndMachineryMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Plant and Machinery [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_PlantAndMachineryMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Plant and machinery.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Repayment of loans and borrowings</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel">Repayments of borrowings</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Repayments of borrowings, classified as financing activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressPostalZipCode_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Address, Postal Zip Code</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForEmployeeBenefitsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Description of accounting policy for employee benefits [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForEmployeeBenefitsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Employee benefits</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_TaxEffectOfBargainPurchaseGain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Tax effect of bargain purchase gain</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_TaxEffectOfBargainPurchaseGain_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Tax effect of bargain purchase gain.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_TaxEffectOfBargainPurchaseGain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Tax effect of bargain purchase gain</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfChangesInAccountingPoliciesAccountingEstimatesAndErrorsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of changes in accounting policies, accounting estimates and errors [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfChangesInAccountingPoliciesAccountingEstimatesAndErrorsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Revision of Successor Financial Statements</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash flows from (used in) financing activities [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Financing activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskBoardCommitteeOrSubcommitteeResponsibleForOversightTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Board Committee or Subcommittee Responsible for Oversight [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AccumulatedImpairmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Loss Allowance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AccumulatedImpairmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accumulated impairment [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_FinanceIncomeAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finance Income [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_FinanceIncomeAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Finance Income.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_FinanceIncomeAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Finance income</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_StatementOfProfitOrLossAndOtherComprehensiveIncomeAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Statement of profit or loss and other comprehensive income [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityIncorporationStateCountryCode_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Incorporation, State or Country Code</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_Assets_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total Assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_Assets_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_Assets_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Assets at beginning of period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_Assets_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Assets at end of period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_Assets_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Total Assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NoncurrentProvisions_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Non-current provisions</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NoncurrentProvisions_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total non-current provisions</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NoncurrentProvisions_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Provisions</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfReasonsWhyTransactionResultedInGainInBargainPurchase_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Description of reasons why bargain purchase transaction resulted in gain</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfReasonsWhyTransactionResultedInGainInBargainPurchase_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Description of bargain purchase gain</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_RightofuseAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Right-of-use assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_RightofuseAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Right-of-use assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_RightofuseAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Beginning balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_RightofuseAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Ending balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_EquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equity [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_EquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Equity</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_RoyaltyExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Royalties</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_RoyaltyExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Royalty expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CounterpartiesDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Counterparties [domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_IncomeStatementLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Income statement [line items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_IncomeStatementLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Income statement.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IncomeTaxExpenseContinuingOperations_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Tax expense (income)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IncomeTaxExpenseContinuingOperations_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel">Tax income (expense)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IncomeTaxExpenseContinuingOperations_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Income tax expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IncomeTaxExpenseContinuingOperations_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Income tax expenses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IncomeTaxExpenseContinuingOperations_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Income tax expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IncomeTaxExpenseContinuingOperations_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel">Income tax expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Foreign exchange gain (loss)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss_lbl" xlink:role="http://www.xbrl.org/2009/role/netLabel">Net foreign exchange gain (loss)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_GainLossOnRemeasurementOfNetDefinedBenefitLiabilityAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Actuarial remeasurement charged to other comprehensive income</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_GainLossOnRemeasurementOfNetDefinedBenefitLiabilityAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Decrease (increase) in net defined benefit liability (asset) resulting from gain (loss) on remeasurement in other comprehensive income</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_GainLossOnRemeasurementOfNetDefinedBenefitLiabilityAsset_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel">Total increase (decrease) in net defined benefit liability (asset) resulting from loss (gain) on remeasurement in other comprehensive income</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_GainLossOnRemeasurementOfNetDefinedBenefitLiabilityAsset_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Actuarial remeasurement charged to other comprehensive income</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_PreviouslyStatedMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Previously stated [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_PreviouslyStatedMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">As Previously Reported</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_TopPentagonSdnBhdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Top Pentagon Sdn. Bhd. [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_TopPentagonSdnBhdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Top Pentagon Sdn. Bhd.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_TopPentagonSdnBhdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Top Pentagon Sdn. Bhd.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_GoodsAndServicesTaxPayableNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Goods and services tax payable net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_GoodsAndServicesTaxPayableNet_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Goods and services tax payable net.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_GoodsAndServicesTaxPayableNet_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Goods and services tax payable, net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_StatementOfCashFlowsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Statement of cash flows [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AdjustmentsForReconcileProfitLossAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Adjustments to reconcile profit (loss) [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AdjustmentsForReconcileProfitLossAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Adjustments for:</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_AuditorName_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Auditor Name</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DeferredTaxExpenseIncomeRecognisedInProfitOrLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred tax expense (income) recognised in profit or loss</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DeferredTaxExpenseIncomeRecognisedInProfitOrLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Recognized in profit or loss</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_InterestPaidClassifiedAsFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel">Interest paid</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_InterestPaidClassifiedAsFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest paid, classified as financing activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_LoansAndBorrowingsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Loans and Borrowings</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_LoansAndBorrowingsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Loans and Borrowings [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_LoansAndBorrowingsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Loans and Borrowings.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_RelatedPartyTransactionsAmountReceivableSettlementPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Amount receivables, outstanding balances settlement period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_RelatedPartyTransactionsAmountReceivableSettlementPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Related Party Transactions Amount Receivable Settlement Period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_RelatedPartyTransactionsAmountReceivableSettlementPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Related party transactions amount receivable settlement period.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DepreciationExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Depreciation expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DepreciationExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Depreciation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_TaxPaidAriseFromTaxAssessment_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Tax paid arise from tax assessment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_TaxPaidAriseFromTaxAssessment_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Tax Paid Arise from Tax Assessment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_TaxPaidAriseFromTaxAssessment_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Tax paid arise from tax assessment.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NoncontrollingInterests_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Non-controlling interests</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NoncontrollingInterests_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Non-controlling interests</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of associates [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Equity Method Investments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Non-adjusting events after reporting period [domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ImpactOfDifferentTaxRateInOtherJurisdictionAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Impact of different tax rate in other jurisdiction amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ImpactOfDifferentTaxRateInOtherJurisdictionAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Impact of different tax rate in other jurisdiction amount.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ImpactOfDifferentTaxRateInOtherJurisdictionAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Impact of different tax rate in other jurisdiction</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_TimingOfTransferOfGoodsOrServicesDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Timing of transfer of goods or services [domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_NetChangeInInventories_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net change in inventories for the period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_NetChangeInInventories_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Net change in inventories</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_NetChangeInInventories_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Net change in inventories.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ProportionOfVotingPowerHeldInAssociate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Proportion of voting rights held in associate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ProportionOfVotingPowerHeldInAssociate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Percentage of voting power of another entity</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ActuarialAssumptionOfExpectedRatesOfSalaryIncreases_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Actuarial assumption of expected rates of salary increases</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ActuarialAssumptionOfExpectedRatesOfSalaryIncreases_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Salary growth rate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_RetainedEarningsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Retained earnings [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_RetainedEarningsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">(Accumulated Deficit)/Retained Earnings</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_LeaseLiabilitiesInterestRate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lease Liabilities, Interest Rate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_LeaseLiabilitiesInterestRate_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Lease liabilities, interest rate.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_LeaseLiabilitiesInterestRate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Lease liabilities, Interest rate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_LiabilitiesArisingFromFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Liabilities arising from financing activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_LiabilitiesArisingFromFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Beginning Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_LiabilitiesArisingFromFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Ending Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfInterestsInAssociatesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of interests in associates [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfInterestsInAssociatesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Equity Method Investments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_PurchaseConsiderationPaidReceived_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Purchase Consideration Paid Received</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_PurchaseConsiderationPaidReceived_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Purchase consideration paid received.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_PurchaseConsiderationPaidReceived_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Less: Purchase consideration</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_PurchaseConsiderationPaidReceived_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Less: Purchase consideration</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other comprehensive income that will be reclassified to profit or loss, net of tax</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Other comprehensive income, net of tax</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_CashPaymentForManagementBuyout_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash Payment For Management Buyout</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_CashPaymentForManagementBuyout_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Cash payment for management buyout.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_CashPaymentForManagementBuyout_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Cash payment for management buyout</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_IncreaseDecreaseThroughChangesInInterestExpenseRelatedToLiabilitiesArisingFromFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase (decrease) through changes in Interest Expense Related To Liabilities Arising From Financing Activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_IncreaseDecreaseThroughChangesInInterestExpenseRelatedToLiabilitiesArisingFromFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Increase (decrease) through changes in interest expense related to liabilities arising from financing activities.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_IncreaseDecreaseThroughChangesInInterestExpenseRelatedToLiabilitiesArisingFromFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Interest expenses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Description of accounting policy for property, plant and equipment [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Property, plant and equipment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForMeasuringInventories_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Inventories</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForMeasuringInventories_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Description of accounting policy for measuring inventories [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of detailed information about borrowings [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_IncreaseInDefinedBenefitObligationDueToIncreaseInActuarialAssumptionOfFutureSalaryGrowth_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase In Defined Benefit Obligation Due To Increase In Actuarial Assumption Of Future Salary Growth</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_IncreaseInDefinedBenefitObligationDueToIncreaseInActuarialAssumptionOfFutureSalaryGrowth_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Increase in defined benefit obligation due to increase in actuarial assumption of future salary growth.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_IncreaseInDefinedBenefitObligationDueToIncreaseInActuarialAssumptionOfFutureSalaryGrowth_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Salary growth rate 1% increase</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="country_SA_lbl" xlink:role="http://www.xbrl.org/2003/role/label">SAUDI ARABIA</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="country_SA_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Saudi</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="country_SA_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Saudi Arabia</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_CurrentTradeReceivablesIncludingAllowanceForExpectedCreditLosses_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Current Trade Receivables Including Allowance For Expected Credit Losses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_CurrentTradeReceivablesIncludingAllowanceForExpectedCreditLosses_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Current trade receivables including allowance for expected credit losses.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_CurrentTradeReceivablesIncludingAllowanceForExpectedCreditLosses_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Trade receivables</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_AccumulatedAmortisationAndImpairmentLossesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accumulated Amortisation and Impairment Losses [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_AccumulatedAmortisationAndImpairmentLossesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Accumulated amortisation and impairment losses.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_AccumulatedAmortisationAndImpairmentLossesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accumulated amortization and impairment losses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_MarketsOfCustomersDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Markets of customers [domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentInformationTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Information [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskManagementProcessesIntegratedTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Management Processes Integrated [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NoncurrentLeaseLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Non-current lease liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NoncurrentLeaseLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Lease liabilities, non-current</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NoncurrentLeaseLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Lease liabilities - non-current</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_PurchaseOfIntangibleAssetsClassifiedAsInvestingActivities_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Acquisition of intangible asset</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_PurchaseOfIntangibleAssetsClassifiedAsInvestingActivities_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel">Purchase of intangible assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_PurchaseOfIntangibleAssetsClassifiedAsInvestingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Purchase of intangible assets, classified as investing activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_EquipmentCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equipment costs</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_EquipmentCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Equipment costs.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfCreditRiskExposureExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of credit risk exposure [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfCreditRiskExposureExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Information About Exposure To Credit Risk and ECLs For Trade Receivables and Contract Assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AdjustmentsForIncreaseDecreaseInEmployeeBenefitLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Adjustments for increase (decrease) in employee benefit liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AdjustmentsForIncreaseDecreaseInEmployeeBenefitLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Employee benefits obligation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ZATCAMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">ZATCA [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ZATCAMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">ZATCA.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ZATCAMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">ZATCA</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OMSOilfieldHoldingsSdnBhdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">OMS Oilfield Holdings Sdn. Bhd. [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OMSOilfieldHoldingsSdnBhdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">OMS Oilfield Holdings Sdn. Bhd.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OMSOilfieldHoldingsSdnBhdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">OMS Oilfield Holdings Sdn. Bhd.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ComputerAndOfficeEquipmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Computer and Office Equipment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ComputerAndOfficeEquipmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Computer and Office Equipment [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ComputerAndOfficeEquipmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Computer and Office Equipment Member</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ServicesTransferredAtAPointInTimeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Services Transferred at a Point In Time [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ServicesTransferredAtAPointInTimeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Services transferred at a point in time.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ServicesTransferredAtAPointInTimeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Services Transferred at a Point In Time</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DeferredTaxAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred tax assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DeferredTaxAssets_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Deferred tax assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DeferredTaxAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total deferred tax assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DeferredTaxAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Deferred tax assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DeferredTaxAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Ending balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DeferredTaxAssets_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedPeriodStartLabel">Deferred Tax Assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DeferredTaxAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Beginning balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AdjustmentsForUndistributedProfitsOfInvestmentsAccountedForUsingEquityMethod_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Adjustments for undistributed profits of investments accounted for using equity method</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AdjustmentsForUndistributedProfitsOfInvestmentsAccountedForUsingEquityMethod_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Share of profits of equity method investments, net of tax</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AdjustmentsForUndistributedProfitsOfInvestmentsAccountedForUsingEquityMethod_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Share of associates' profits during the year</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfFinancialInstrumentsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of detailed information about financial instruments [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OMSOilfieldServicesPteLtdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">OMS Oilfield Services Pte. Ltd.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OMSOilfieldServicesPteLtdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">OMS Oilfield Services Pte. Ltd. [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OMSOilfieldServicesPteLtdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">OMS Oilfield Services Pte. Ltd.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_TradeAndOtherPayablesRecognisedAsOfAcquisitionDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Trade and other payables recognised as of acquisition date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_TradeAndOtherPayablesRecognisedAsOfAcquisitionDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Trade payables</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_TradeAndOtherPayablesRecognisedAsOfAcquisitionDate_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Trade payables</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of non-adjusting events after reporting period [table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CurrentLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Current liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CurrentLiabilities_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Current liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CurrentLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total Current Liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfOtherIncomeExpensesByRelatedPartiesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure Of Other Income Expenses By Related Parties Explanatory</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfOtherIncomeExpensesByRelatedPartiesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Disclosure of other income expenses by related parties explanatory.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfOtherIncomeExpensesByRelatedPartiesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Other Income/(Expenses)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_BusinessContactMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Contact [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DeferredTaxLiabilitiesRecognisedAsOfAcquisitionDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred tax liabilities recognised as of acquisition date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DeferredTaxLiabilitiesRecognisedAsOfAcquisitionDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Deferred tax liabilities, net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DeferredTaxLiabilitiesRecognisedAsOfAcquisitionDate_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Deferred tax liabilities, net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityCentralIndexKey_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Central Index Key</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityCentralIndexKey_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Central Index Key</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_AllowanceForExpectedCreditLosses_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Allowance For Expected Credit Losses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_AllowanceForExpectedCreditLosses_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Allowance for expected credit losses.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_AllowanceForExpectedCreditLosses_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Less: Allowance for expected credit losses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_AllowanceForExpectedCreditLosses_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">At beginning of period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_AllowanceForExpectedCreditLosses_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">At end of period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CounterpartiesAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Counterparties [axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Consideration transferred, acquisition-date fair value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total consideration transferred, acquisition-date fair value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash consideration</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="currency_SGD_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Singapore, Dollars</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="currency_SGD_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Singapore Dollar</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IncreaseDecreaseThroughConversionOfConvertibleInstruments_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase (decrease) through conversion of convertible instruments, equity</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IncreaseDecreaseThroughConversionOfConvertibleInstruments_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Conversion of convertible notes</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_SellingGeneralAndAdministrativeExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Selling, general and administrative expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_SellingGeneralAndAdministrativeExpense_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Selling, general and administrative expenses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_SellingGeneralAndAdministrativeExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total selling, general and administrative expenses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IncreaseDecreaseInNetDefinedBenefitLiabilityAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase (decrease) in net defined benefit liability (asset)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IncreaseDecreaseInNetDefinedBenefitLiabilityAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total increase (decrease) in net defined benefit liability (asset)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IncreaseDecreaseInNetDefinedBenefitLiabilityAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Expenses charged to statement of profit or loss</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of detailed information about borrowings [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Loans and Borrowings</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_IDRTenPercentStrengtheningMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">IDR (10% Strengthening)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_IDRTenPercentStrengtheningMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">IDR Ten Percent Strengthening [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_IDRTenPercentStrengtheningMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">IDR ten percent strengthening.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfQuantitativeInformationAboutLeasesForLesseeAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of quantitative information about leases for lessee [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_MovementInDeferredTaxAssetsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Movement in deferred tax assets [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_MovementInDeferredTaxAssetsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Movement in deferred tax assets.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_MovementInDeferredTaxAssetsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Movement in deferred tax assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_TransactionsWithOwnersOfTheCompanyShares_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Transactions with Owners of the Company Shares</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_TransactionsWithOwnersOfTheCompanyShares_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Transactions with owners of the company shares.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_TransactionsWithOwnersOfTheCompanyShares_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Total transactions with owners of the company, shares</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_TransactionsWithOwnersOfTheCompanyShares_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Total shares transferred to owners</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_UnrecognisedDeferredTaxAssetsDescription_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Unrecognised deferred tax assets description</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_UnrecognisedDeferredTaxAssetsDescription_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Unrecognised deferred tax assets description.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ComponentsOfEquityDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Components of equity [domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CategoriesOfFinancialLiabilitiesAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Categories of financial liabilities [axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OMSOilfieldServicesThailandLtdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">OMS Oilfield Services Thailand Ltd. [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OMSOilfieldServicesThailandLtdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">OMS Oilfield Services Thailand Ltd.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OMSOilfieldServicesThailandLtdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">OMS Oilfield Services (Thailand) Ltd.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AmortisationIntangibleAssetsOtherThanGoodwill_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Amortisation, intangible assets other than goodwill</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AmortisationIntangibleAssetsOtherThanGoodwill_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Amortisation, intangible assets other than goodwill</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AmortisationIntangibleAssetsOtherThanGoodwill_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Amortization of intangible assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ClassesOfShareCapitalDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Classes of share capital [domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DepreciationPropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Depreciation, property, plant and equipment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DepreciationPropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Depreciation, property, plant and equipment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DepreciationPropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Depreciation of property, plant and equipment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_AccruedInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accrued interest</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_AccruedInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Accrued interest.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressStateOrProvince_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Address, State or Province</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Adjustments for increase (decrease) in trade and other payables</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Trade and other payables</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfDetailedInformationAboutBusinessCombinationsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of detailed information about business combination [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfDetailedInformationAboutBusinessCombinationsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Fair Value of Identifiable Assets Acquired and Liabilities Assumed</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_CapitalContributionShares_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Capital Contribution Shares</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_CapitalContributionShares_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Capital contribution shares.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_CapitalContributionShares_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Capital contribution, shares</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DeferredTaxAssetsAllowance_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred tax assets allowance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DeferredTaxAssetsAllowance_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Deferred tax assets allowance.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DeferredTaxAssetsAllowance_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Less: deferred tax assets allowance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_LoansAndBorrowingsArisingFromFinancingActivitiesEndingBalance_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Loans And Borrowings Arising From Financing Activities Ending Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_LoansAndBorrowingsArisingFromFinancingActivitiesEndingBalance_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Loans and borrowings arising from financing activities ending balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_LoansAndBorrowingsArisingFromFinancingActivitiesEndingBalance_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Loans and borrowings ending balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_InterestBearingLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest Bearing Liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_InterestBearingLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Interest bearing liabilities.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_InterestBearingLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total interest-bearing liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfRelatedPartyExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Related Parties</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfRelatedPartyExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of related party [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OMSHoldingsPteLtdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">OMS Holdings Pte. Ltd [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OMSHoldingsPteLtdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">OMS Holdings Pte. Ltd member.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OMSHoldingsPteLtdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">OMS Holdings Pte. Ltd.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfMovementInEmployeesRetirementBenefitsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Movement in Employee's Retirement Benefits</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfMovementInEmployeesRetirementBenefitsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of Movement in Employee's Retirement Benefits Explanatory</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfMovementInEmployeesRetirementBenefitsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Summary of movement in employees retirement benefits.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfTradeAndOtherPayablesExplanatoryTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of trade and other payables explanatory [table text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfTradeAndOtherPayablesExplanatoryTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Disclosure of trade and other payables explanatory.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfTradeAndOtherPayablesExplanatoryTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Trade and Other Payables</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OMSOilfieldServicesSdnBhdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">OMS Oilfield Services Sdn. Bhd. [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OMSOilfieldServicesSdnBhdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">OMS Oilfield Services Sdn. Bhd.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OMSOilfieldServicesSdnBhdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">OMS Oilfield Services Sdn. Bhd.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Gains (losses) on exchange differences on translation of foreign operations, net of tax</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationNetOfTax_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Foreign currency translation differences</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Classes of intangible assets other than goodwill [axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentRegistrationStatement_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Registration Statement</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NoncurrentPayables_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total trade and other non-current payables</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NoncurrentPayables_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Trade and other non-current payables</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_NumberOfSharesAcquired_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Number of shares acquired</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_NumberOfSharesAcquired_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Number of shares acquired.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OMSOilfieldServicesArabiaLtdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">OMS Oilfield Services Arabia Ltd.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OMSOilfieldServicesArabiaLtdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">OMS Oilfield Services Arabia Ltd. [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OMSOilfieldServicesArabiaLtdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">OMS Oilfield Services Arabia Ltd.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AttributionOfExpensesByNatureToTheirFunctionAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Attribution of expenses by nature to their function [axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisposalsPropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Disposals</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisposalsPropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disposals, property, plant and equipment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfInformationAboutDefinedBenefitPlansAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of information about defined benefit plans [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_RevenueFromContractsWithCustomers_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Revenue from contracts with customers</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_RevenueFromContractsWithCustomers_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Revenue</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of reconciliation of liabilities arising from financing activities [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_TradeAndOtherPayablesTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Trade And Other Payables [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_TradeAndOtherPayablesTable_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Trade And Other Payables.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of detailed information about property, plant and equipment [table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OMSEnergyTechnologiesPteLtdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">OMS Energy Technologies Pte. Ltd. [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OMSEnergyTechnologiesPteLtdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">OMS Energy Technologies Pte. Ltd. member.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OMSEnergyTechnologiesPteLtdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">OMS Energy Technologies Pte. Ltd.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Non-adjusting events after reporting period [axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AnalysisOfIncomeAndExpenseAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Analysis of income and expense [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_InterestIncomeFromAmountDueFromRelatedParties_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Interest income from amount due from related parties</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_InterestIncomeFromAmountDueFromRelatedParties_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest Income From Amount Due From Related Parties</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_InterestIncomeFromAmountDueFromRelatedParties_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Interest income from amount due from related parties.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForFinancialInstrumentsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Description of accounting policy for financial instruments [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForFinancialInstrumentsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Financial instruments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_IDRTenPercentWeakeningMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">IDR (10% Weakening)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_IDRTenPercentWeakeningMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">IDR ten percent weakening [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_IDRTenPercentWeakeningMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">IDR ten percent weakening.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IntangibleAssetsAndGoodwill_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Intangible assets and goodwill</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IntangibleAssetsAndGoodwill_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total intangible assets and goodwill</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IntangibleAssetsAndGoodwill_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Intangible assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IntangibleAssetsAndGoodwill_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Intangible assets at beginning of period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IntangibleAssetsAndGoodwill_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Intangible assets at end of period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IntangibleAssetsAndGoodwill_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedPeriodStartLabel">Intangible assets at beginning of period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IntangibleAssetsAndGoodwill_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedPeriodEndLabel">Intangible assets at end of period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_CoverAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cover [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_LeaseLiabilitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lease liabilities [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NumberOfSharesAuthorised_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Authorized share capital</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NumberOfSharesAuthorised_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Number of shares authorised</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DescriptionOfAccountingPolicyForContractAssetsExplanatoryPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Contract assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DescriptionOfAccountingPolicyForContractAssetsExplanatoryPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Description of accounting policy for contract assets explanatory [policy text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DescriptionOfAccountingPolicyForContractAssetsExplanatoryPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Description of accounting policy for contract assets explanatory.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_OtherCurrentPayables_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Others</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_OtherCurrentPayables_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other current payables</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OMSETINCMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">OMSET Inc</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OMSETINCMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">OMSET INC [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OMSETINCMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">OMSET INC.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_LaterThanOneMonthAndNotLaterThanTwoMonthsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Later than one month and not later than two months [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_LaterThanOneMonthAndNotLaterThanTwoMonthsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">31 - 60 Days Past Due</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_FunctionalOrPresentationCurrencyMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Functional or presentation currency [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_InterestExpensesFromAmountDueToRelatedParties_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest Expenses From Amount Due To Related Parties</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_InterestExpensesFromAmountDueToRelatedParties_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Interest expenses from amount due to related parties.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_InterestExpensesFromAmountDueToRelatedParties_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Interest expenses from amount due to related parties</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_HowcoMetalsManagementPteLtdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Howco Metals Management Pte. Ltd. [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_HowcoMetalsManagementPteLtdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Howco Metals Management Pte. Ltd. [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_HowcoMetalsManagementPteLtdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Howco Metals Management Pte. Ltd.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_GrossCarryingAmountMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Gross carrying amount [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_GrossCarryingAmountMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cost</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_GrossCarryingAmountMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Gross Carrying Amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfClassificationOfLiabilitiesAsCurrentOrNoncurrentTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure Of Classification Of Liabilities as Current or Noncurrent [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfClassificationOfLiabilitiesAsCurrentOrNoncurrentTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Disclosure of classification of liabilities as current or noncurrent.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfClassificationOfLiabilitiesAsCurrentOrNoncurrentTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Adoption of new accounting policies</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DeferredTaxExpenseIncomeRelatingToOriginationAndReversalOfTemporaryDifferences_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred tax expense (income) relating to origination and reversal of temporary differences</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DeferredTaxExpenseIncomeRelatingToOriginationAndReversalOfTemporaryDifferences_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Origination and reversal of temporary difference</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of temporary difference, unused tax losses and unused tax credits [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Deferred Tax Assets and Liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfAttributionOfExpensesByNatureToTheirFunctionTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of attribution of expenses by nature to their function [table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_LandAndBuildingsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Land and buildings [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_LandAndBuildingsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Land and Buildings</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForFinanceIncomeAndCostsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Description of accounting policy for finance income and costs [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForFinanceIncomeAndCostsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Finance income and finance costs</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ProportionOfOwnershipInterestInAssociate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Proportion of ownership interest in associate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ProportionOfOwnershipInterestInAssociate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Ownership percentage</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfMovementsInDeferredTaxBalancesExplanatoryTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of movements in deferred tax balances explanatory [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfMovementsInDeferredTaxBalancesExplanatoryTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Disclosure of movements in deferred tax balances explanatory.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfMovementsInDeferredTaxBalancesExplanatoryTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Movement In Deferred Tax Balances.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentAnnualReport_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Annual Report</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_EffectOfExchangeRateChangesOnCashCashEquivalentsAndRestrictedCash_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Effect Of Exchange Rate Changes On Cash Cash Equivalents And Restricted Cash</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_EffectOfExchangeRateChangesOnCashCashEquivalentsAndRestrictedCash_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The effect of exchange rate changes on cash, cash equivalents and restricted cash held or due in a foreign currency.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_EffectOfExchangeRateChangesOnCashCashEquivalentsAndRestrictedCash_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Effect of foreign exchange on cash, cash equivalents and restricted cash</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ProvisionsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Provisions</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ProvisionsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Provisions [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ProvisionsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Provisions.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OtherPayablesAverageTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Payables Average Term</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OtherPayablesAverageTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Other payables average term.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OtherPayablesAverageTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other payables average term</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AdjustmentsForDecreaseIncreaseInOtherCurrentAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Adjustments for decrease (increase) in other current assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AdjustmentsForDecreaseIncreaseInOtherCurrentAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Prepayment and other current assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ClassesOfShareCapitalAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Classes of share capital [axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_Accruals_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accruals</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_Accruals_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accruals</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_IncreaseDecreaseThroughTransferredToTradeReceivables_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase Decrease Through Transferred to Trade Receivables</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_IncreaseDecreaseThroughTransferredToTradeReceivables_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Increase decrease through transferred to trade receivables.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_IncreaseDecreaseThroughTransferredToTradeReceivables_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Transferred to trade receivables</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfChangesInAccountingEstimatesTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of changes in accounting estimates [table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_KeyManagementPersonnelCompensationShorttermEmployeeBenefits_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Short-term employee benefits</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_KeyManagementPersonnelCompensationShorttermEmployeeBenefits_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Key management personnel compensation, short-term employee benefits</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_AdditionalTaxLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Additional Tax Liability</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_AdditionalTaxLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Additional tax liability.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_AdditionalTaxLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Additional tax liability</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_PropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Property, plant and equipment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_PropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total property, plant and equipment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_PropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Beginning balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_PropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Ending balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_PropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Property, plant and equipment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_AllowanceForInventoriesObsolescence_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Allowance for inventories obsolescence</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_AllowanceForInventoriesObsolescence_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Allowance for inventories obsolescence.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_AllowanceForInventoriesObsolescence_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Less: Allowance for inventories obsolescence</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OtherMinorityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Minority [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OtherMinorityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Other Minority.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OtherMinorityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other Minority</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_WeightedAverageOrdinarySharesIssuedBasicAndDiluted_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Issued ordinary shares at the beginning of year/period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_WeightedAverageOrdinarySharesIssuedBasicAndDiluted_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Weighted average ordinary shares issued basic and diluted</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_WeightedAverageOrdinarySharesIssuedBasicAndDiluted_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Weighted average ordinary shares issued basic and diluted.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_BusinessCombinationsDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business combinations [domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ProceedsFromIssueOfOrdinaryShares_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Proceeds from issue of ordinary shares</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ProceedsFromIssueOfOrdinaryShares_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Proceeds from capital injection</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DeferredTaxAssetsNotRecognizedAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Deferred tax assets not recognized</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DeferredTaxAssetsNotRecognizedAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred tax assets not recognized amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DeferredTaxAssetsNotRecognizedAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Deferred tax assets not recognized amount.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DeferredTaxAssetsNotRecognizedAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ConvertibleBondInvestorsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Convertible Bond Investors [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ConvertibleBondInvestorsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Convertible Bond Investors.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ConvertibleBondInvestorsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Convertible Bond Investors</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_IncreaseDecreaseInPaymentOfInterestArisingFromFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Interest paid</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_IncreaseDecreaseInPaymentOfInterestArisingFromFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase (decrease) in payment of interest arising from financing activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_IncreaseDecreaseInPaymentOfInterestArisingFromFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Increase (decrease) in payment of interest arising from financing activities.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_IncreaseDecreaseInPaymentOfInterestArisingFromFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Interest paid</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CostOfSales_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total cost of revenue</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CostOfSales_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cost of sales</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CostOfSales_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Cost of sales</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CostOfSales_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Total cost of revenue</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_PaymentOfAdditionalTaxLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Payment Of Additional Tax Liability</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_PaymentOfAdditionalTaxLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Payment of additional tax liability.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_PaymentOfAdditionalTaxLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Payment of additional tax liability</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash flows from (used in) operating activities [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Operating activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_NumberOfReportableSegments1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Number Of Reportable Segments1</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_NumberOfReportableSegments1_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Number of reportable segments.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_NumberOfReportableSegments1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of reportable segments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_SellingGeneralAndAdministrativeExpenseMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Selling, General and Administrative Expenses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_SellingGeneralAndAdministrativeExpenseMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Selling, general and administrative expense [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_CurrentDeposits_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Current Deposits</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_CurrentDeposits_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Current deposits.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_CurrentDeposits_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Deposits, current</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_MovementInDeferredTaxBalancesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Movement in deferred tax balances [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_MovementInDeferredTaxBalancesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Movement in deferred tax balances.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_OtherComprehensiveIncomeAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other comprehensive income [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_OtherComprehensiveIncomeAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other comprehensive income:</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_OtherComprehensiveIncomeAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Other comprehensive income</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_PremisesCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Premises costs</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_PremisesCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Premises costs.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OtherAncillaryServicesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other ancillary services [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OtherAncillaryServicesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Other ancillary services.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OtherAncillaryServicesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other Ancillary Services</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_UsefulLifeMeasuredAsPeriodOfTimeIntangibleAssetsOtherThanGoodwill_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Useful life measured as period of time, intangible assets other than goodwill</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_UsefulLifeMeasuredAsPeriodOfTimeIntangibleAssetsOtherThanGoodwill_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Estimated useful life</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_SaleOfOilfieldEquipmentProductsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Sale of Oilfield Equipment Products [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_SaleOfOilfieldEquipmentProductsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Sale of oilfield equipment products.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_SaleOfOilfieldEquipmentProductsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Sale of Oilfield Equipment Products</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ImpactOfDifferentTaxRateInOtherJurisdiction_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Impact of different tax rate in other jurisdiction</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ImpactOfDifferentTaxRateInOtherJurisdiction_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Impact of different tax rate in other jurisdiction.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ImpactOfDifferentTaxRateInOtherJurisdiction_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Impact of different tax rate in other jurisdiction (Percentage)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressCountry_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Address, Country</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ComponentsOfEquityAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Components of equity [axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_PurchasesOfGoodsRelatedPartyTransactions_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cost of revenue - related parties</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_PurchasesOfGoodsRelatedPartyTransactions_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Purchases of goods, related party transactions</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForRecognitionOfRevenue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Description of accounting policy for recognition of revenue [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForRecognitionOfRevenue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Revenue</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfEventsAfterReportingPeriodExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of events after reporting period [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfEventsAfterReportingPeriodExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Subsequent Events</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfBasisOfPreparationOfFinancialStatementsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of basis of preparation of financial statements [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfBasisOfPreparationOfFinancialStatementsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Basis of preparation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_MajorOrdinaryShareTransactionsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Major ordinary share transactions [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_MajorOrdinaryShareTransactionsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Ordinary Shares</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_InterestExpenseOnBankLoansAndOverdrafts_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest expense on bank loans and overdrafts</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_InterestExpenseOnBankLoansAndOverdrafts_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Interest expenses from loans and borrowings</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_EquityAttributableToOwnersOfParentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equity attributable to owners of parent [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_EquityAttributableToOwnersOfParentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Equity Attributable to Shareholders of the Company</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskManagementPositionsOrCommitteesResponsibleTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Management Positions or Committees Responsible [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CurrentAssetsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Current assets [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CurrentAssetsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Current assets:</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_WritedownsReversalsOfInventories_lbl" xlink:role="http://www.xbrl.org/2009/role/netLabel">Net write-downs (reversals of write-downs) of inventories</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_WritedownsReversalsOfInventories_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Write-downs (reversals of write-downs) of inventories</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_WritedownsReversalsOfInventories_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Reversal of inventories obsolescence</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_AdditionalCashPaymentToAssociates_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Additional Cash Payment To Associates</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_AdditionalCashPaymentToAssociates_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Additional cash payment to associates.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_AdditionalCashPaymentToAssociates_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Additional cash payment to associates</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OtherIncomeExpensesNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other income/(expenses), net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OtherIncomeExpensesNet_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Other income/(expenses), net.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OtherIncomeExpensesNet_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total other income/(expenses), net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ProfitLossOfAcquiree_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Profit (loss) of acquiree since acquisition date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ProfitLossOfAcquiree_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net profit since acquisition date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ProportionOfOwnershipInterestByCEO_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Proportion of ownership interest by CEO</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ProportionOfOwnershipInterestByCEO_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Proportion of ownership interest by CEO.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ProportionOfOwnershipInterestByCEO_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Ownership Percentage</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_GrossLeaseLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Gross lease liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_GrossLeaseLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Lease obligation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForForeignCurrencyTranslationExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Foreign currency</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForForeignCurrencyTranslationExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Description of accounting policy for foreign currency translation [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_TaxProvisionRecognisedAsOfAcquisitionDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Tax Provision Recognised As Of Acquisition Date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_TaxProvisionRecognisedAsOfAcquisitionDate_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Tax provision recognised as of acquisition date.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_TaxProvisionRecognisedAsOfAcquisitionDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Tax provision</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_TaxProvisionRecognisedAsOfAcquisitionDate_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Tax provision</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_RevenueOfCombinedEntity_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Revenue of combined entity as if combination occurred at beginning of period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_RevenueOfCombinedEntity_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Consolidated pro-forma revenue if acquisition occurred at beginning of period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_OtherExpenseByNature_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Others</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_OtherExpenseByNature_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other expenses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_OtherExpenseByNature_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel">Other expenses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_OtherExpenseByNature_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other expenses, by nature</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressAddressLine1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Address, Address Line One</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DeferredTaxExpenseIncomeAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Deferred tax expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DeferredTaxExpenseIncomeAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred tax expense (income) [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ProvisionsForEmployeeBenefits_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Provisions for employee benefits</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ProvisionsForEmployeeBenefits_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Employee benefits obligation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskProcessForInformingBoardCommitteeOrSubcommitteeResponsibleForOversightTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Process for Informing Board Committee or Subcommittee Responsible for Oversight [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_PremiumThreadingServicesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Premium Threading Services [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_PremiumThreadingServicesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Premium threading services.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_PremiumThreadingServicesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Premium Threading Services</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_Borrowings_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Successor</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_Borrowings_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total interest-bearing liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_Borrowings_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Borrowings</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfAssetsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Description of accounting policy for impairment of assets [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfAssetsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Impairment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_OtherCurrentAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other current assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_OtherCurrentAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other current assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_LiabilitiesArisingFromFinancingActivitiesDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Liabilities arising from financing activities [domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ForeignExchangeLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Foreign exchange loss</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ForeignExchangeLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Loss from foreign exchange</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ForeignExchangeLoss_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Loss from foreign exchange</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfShareCapitalReservesAndOtherEquityInterestExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of share capital, reserves and other equity interest [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfShareCapitalReservesAndOtherEquityInterestExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Capital and Reserves</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AssetsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Assets [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_EmployeeBenefitsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Employee benefits</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_EmployeeBenefitsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Employee benefits [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_EmployeeBenefitsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Employee benefits.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OtherChangesLiability-RelatedAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other changes liability-related [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OtherChangesLiability-RelatedAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Other changes liability-related.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OtherChangesLiability-RelatedAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other changes liability-related</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AdjustmentsForDecreaseIncreaseInInventories_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Adjustments for decrease (increase) in inventories</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AdjustmentsForDecreaseIncreaseInInventories_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Inventories</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_InterestReceivedClassifiedAsOperatingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Interest received</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_InterestReceivedClassifiedAsOperatingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest received, classified as operating activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DescriptionOfAccountingPolicyForStandardsIssuedButNotYetEffectiveExplanatoryPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Standards issued but not yet effective</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DescriptionOfAccountingPolicyForStandardsIssuedButNotYetEffectiveExplanatoryPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Description of accounting policy for standards issued but not yet effective explanatory [policy text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DescriptionOfAccountingPolicyForStandardsIssuedButNotYetEffectiveExplanatoryPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Description of accounting policy for standards issued but not yet effective explanatory.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ScheduleOfAmountsRecognizedInStatementsOfCashFlowsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of amounts recognized in statements of cash flows [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ScheduleOfAmountsRecognizedInStatementsOfCashFlowsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Schedule of amounts recognized in statements of cash flows.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForLeasesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Description of accounting policy for leases [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForLeasesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Leases</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityVoluntaryFilers_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Voluntary Filers</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_InformationAboutLesseesExposureArisingFromExtensionOptionsAndTerminationOptions_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Information about lessee's exposure arising from extension options and termination options</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_InformationAboutLesseesExposureArisingFromExtensionOptionsAndTerminationOptions_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Lessee's exposure arising from extension options and termination options</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NumberOfSharesIssuedAndFullyPaid_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Number of shares issued and fully paid</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NumberOfSharesIssuedAndFullyPaid_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">No. of shares, As at the beginning of period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NumberOfSharesIssuedAndFullyPaid_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">No. of shares, As at end of year</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DeferredTaxAssetsNetOperatingLossCarryforwards_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred tax assets net operating loss carryforwards</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DeferredTaxAssetsNetOperatingLossCarryforwards_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Deferred tax assets net operating loss carryforwards.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DeferredTaxAssetsNetOperatingLossCarryforwards_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Deferred tax assets net operating loss carry forwards</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_AmendmentFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Amendment Flag</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_SurfaceWellheadAndChristmasTreeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Surface Wellhead and Christmas Tree [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_SurfaceWellheadAndChristmasTreeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Surface wellhead and Christmas tree.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_SurfaceWellheadAndChristmasTreeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Surface Wellhead and Christmas Tree</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_MotorVehiclesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Motor vehicles [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_MotorVehiclesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Motor Vehicles</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_StatementOfChangesInEquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Statement of changes in equity [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IssuedCapital_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Share capital</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IssuedCapital_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Issued capital</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IssuedCapital_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total issued capital</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IssuedCapital_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Issued and fully paid ordinary shares: As at the beginning of period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IssuedCapital_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Issued and fully paid ordinary shares: As at end of year</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IncreaseDecreaseThroughChangesInForeignExchangeRatesNetDefinedBenefitLiabilityAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase (decrease) in net defined benefit liability (asset) resulting from changes in foreign exchange rates, net defined benefit liability (asset)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IncreaseDecreaseThroughChangesInForeignExchangeRatesNetDefinedBenefitLiabilityAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Foreign currency translation effect</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_TaxEffectOfRevenuesExemptFromTaxation2011_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Tax effect of revenues exempt from taxation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_TaxEffectOfRevenuesExemptFromTaxation2011_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Tax effect of revenues exempt from taxation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_TaxEffectOfRevenuesExemptFromTaxation2011_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel">Income not subject to tax</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentShellCompanyReport_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Shell Company Report</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_BasicEarningsLossPerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Basic earnings per share (as adjusted)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_BasicEarningsLossPerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Basic earnings (loss) per share</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_BasicEarningsLossPerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total basic earnings (loss) per share</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_BasicEarningsLossPerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Basic earnings per share attributable to shareholders</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_WeightedAverageShares_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Basic weighted-average shares outstanding</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_WeightedAverageShares_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Weighted average number of ordinary shares used in calculating basic earnings per share</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_WeightedAverageShares_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Weighted-average number of ordinary shares at the end of year/period, Basic</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_FinancialAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financial assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_FinancialAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Financial assets at beginning of period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_FinancialAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Financial assets at end of period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_FinancialAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total financial assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CurrentRestrictedCashAndCashEquivalents_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Current restricted cash and cash equivalents</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CurrentRestrictedCashAndCashEquivalents_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Less: Restricted cash, current</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CurrentRestrictedCashAndCashEquivalents_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Restricted cash, current</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_OtherOperatingIncomeExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other operating income (expense)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_OtherOperatingIncomeExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other operating expenses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_OtherOperatingIncomeExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Other income, net - related parties</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_OtherOperatingIncomeExpense_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Other operating expenses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_PercentageOfExercisePriceOfWarrantToPriceOfOrdinarySharesOffered_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Percentage of Exercise Price of Warrant to Price of Ordinary Shares Offered</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_PercentageOfExercisePriceOfWarrantToPriceOfOrdinarySharesOffered_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Percentage of exercise price of warrant to price of ordinary shares offered.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_PercentageOfExercisePriceOfWarrantToPriceOfOrdinarySharesOffered_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Percentage of exercise price of warrant to price of ordinary shares offered</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ClassesOfLiabilitiesDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Classes of liabilities [domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CurrentPrepaymentsAndOtherCurrentAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Current prepayments and other current assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CurrentPrepaymentsAndOtherCurrentAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Prepayment and other current assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CurrentPrepaymentsAndOtherCurrentAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Prepayment and other current assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ExistingShareholdersMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Existing Shareholders [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ExistingShareholdersMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Existing Shareholders.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ExistingShareholdersMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Existing Shareholders</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_TradeAndOtherCurrentReceivablesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Trade and other current receivables [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_CategoriesOfFinancialAssetsAndLiabilitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Categories of financial assets and liabilities [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_CategoriesOfFinancialAssetsAndLiabilitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Categories of financial assets and liabilities.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfPropertyPlantAndEquipmentExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Property, Plant and Equipment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfPropertyPlantAndEquipmentExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of property, plant and equipment [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_NonCurrentPrepaymentsAndOtherNonCurrentAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Prepayment and other non-current assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_NonCurrentPrepaymentsAndOtherNonCurrentAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Non current prepayments and other non current assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_NonCurrentPrepaymentsAndOtherNonCurrentAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Non current prepayments and other non current assets.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_NonCurrentPrepaymentsAndOtherNonCurrentAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Prepayment and other non-current assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_TaxEffectOnChangeInValuationAllowance_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Tax effect on change in valuation allowance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_TaxEffectOnChangeInValuationAllowance_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Tax effect on change in valuation allowance.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_MaterialAccountingPoliciesDetailsLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Material accounting policies details [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_MaterialAccountingPoliciesDetailsLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Material accounting policies details.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentFinStmtErrorCorrectionFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Financial Statement Error Correction [Flag]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_TypesOfCustomersDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Types of customers [domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesRightofuseAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase (decrease) through net exchange differences, right-of-use assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesRightofuseAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Effect of movements in exchange rates</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_BottomOfRangeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Bottom of range [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_BottomOfRangeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Bottom of Range</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfNatureOfRelatedPartyRelationship_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Description of nature of related party relationship</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfNatureOfRelatedPartyRelationship_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Relationship to the Predecessor</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_PTOMSOilfieldServicesIndonesiaMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">PT OMS Oilfield Services Indonesia [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_PTOMSOilfieldServicesIndonesiaMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">PT OMS Oilfield Services Indonesia.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_PTOMSOilfieldServicesIndonesiaMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">PT OMS Oilfield Services (Indonesia)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskMateriallyAffectedOrReasonablyLikelyToMateriallyAffectRegistrantTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_AdditionalTaxAndZakatPayableFromTaxAssessment_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Additional Tax And Zakat Payable From Tax Assessment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_AdditionalTaxAndZakatPayableFromTaxAssessment_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Additional tax and zakat payable from tax assessment.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_AdditionalTaxAndZakatPayableFromTaxAssessment_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Additional tax and zakat payable from tax assessment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ContractLiabilitiesRecognisedAsOfAcquisitionDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Contract liabilities recognised as of acquisition date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ContractLiabilitiesRecognisedAsOfAcquisitionDate_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Lease liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskManagementProcessesIntegratedFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Management Processes Integrated [Flag]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NetDeferredTaxLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Net deferred tax liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NetDeferredTaxLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Deferred tax liabilities, net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_RightOfUseAssetsEffectOfMovementsInExchangeRates_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Effect of movements in exchange rates</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_RightOfUseAssetsEffectOfMovementsInExchangeRates_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Right of use assets effect of movements in exchange rates</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_RightOfUseAssetsEffectOfMovementsInExchangeRates_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Right of use assets effect of movements in exchange rates.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_CashDepositInsured_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash Deposit Insured</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_CashDepositInsured_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Cash deposit insured.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_CashDepositInsured_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash deposit insured</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfClassesOfShareCapitalAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of classes of share capital [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ReconciliationOfAccountingProfitMultipliedByApplicableTaxRatesTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Reconciliation of accounting profit multiplied by applicable tax rates [table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ReconciliationOfAccountingProfitMultipliedByApplicableTaxRatesTable_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Reconciliation of accounting profit multiplied by applicable tax rates.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_PaymentsToRelatedParties_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Payments To Related Parties</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_PaymentsToRelatedParties_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Payments to related parties.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_PaymentsToRelatedParties_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Amount due from a related party</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_PaymentsToRelatedParties_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Amount due from a related party</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_PresentationOfLeasesForLesseeAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Presentation of leases for lessee [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_SharePremiumMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Share Premium</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_SharePremiumMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share premium [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Amounts recognised as of acquisition date for each major class of assets acquired and liabilities assumed [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfGeographicalAreasLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of geographical areas [line items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AmortisationExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Amortisation expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AmortisationExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Amortization</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfFinancialAssetsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Description of accounting policy for impairment of financial assets [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfFinancialAssetsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Financial assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ChiefExecutiveOfficerOfOMSMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Chief Executive Officer ("Mr. How") of OMS</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ChiefExecutiveOfficerOfOMSMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Chief Executive Officer of OMS [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ChiefExecutiveOfficerOfOMSMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Chief Executive Officer of OMS.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_BruneiDollarMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Brunei Dollar [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_BruneiDollarMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Brunei Dollar.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_BruneiDollarMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Brunei Dollar</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DecreaseInDefinedBenefitObligationDueToIncreaseInActuarialAssumptionOfDiscountRate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Decrease In Defined Benefit Obligation Due To Increase In Actuarial Assumption Of Discount Rate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DecreaseInDefinedBenefitObligationDueToIncreaseInActuarialAssumptionOfDiscountRate_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Decrease in defined benefit obligation due to increase in actuarial assumption of discount rate.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DecreaseInDefinedBenefitObligationDueToIncreaseInActuarialAssumptionOfDiscountRate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Discount rate 1% Increase</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_FinancialInstrumentsCreditimpairedMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financial instruments credit-impaired [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_FinancialInstrumentsCreditimpairedMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Credit Impaired</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CategoriesOfFinancialAssetsAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Categories of financial assets [axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_CarryingValueOfEquityMethodInvestments_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Carrying Value of Equity Method Investments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_CarryingValueOfEquityMethodInvestments_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Carrying value of equity method investments.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_CarryingValueOfEquityMethodInvestments_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Carrying value of equity method investment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_TradeAndOtherReceivables_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total trade and other receivables</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_TradeAndOtherReceivables_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Trade and other receivables</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_TradeAndOtherReceivables_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Trade receivables and contract assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ProfessionalFeesExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Legal and professional fees</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ProfessionalFeesExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Professional fees expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Credit impairment of financial instruments [domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_IncreaseDecreaseThroughPaymentOfLeaseLiabilitiesArisingFromFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase (decrease) through payment of lease liabilities arising from financing activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_IncreaseDecreaseThroughPaymentOfLeaseLiabilitiesArisingFromFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Increase (decrease) through payment of lease liabilities arising from financing activities.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_IncreaseDecreaseThroughPaymentOfLeaseLiabilitiesArisingFromFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Payment of lease liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_IncreaseDecreaseThroughPaymentOfLeaseLiabilitiesArisingFromFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Payment of lease liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfFinanceIncomeExpenseExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of finance income (cost) [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfFinanceIncomeExpenseExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Finance Income and Costs</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_FinanceCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finance costs</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_FinanceCosts_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Finance costs</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_FinanceCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Total finance cost</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_FinanceCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Finance cost - related parties</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_FinanceCosts_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel">Total finance cost</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_FinanceCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Finance costs</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_FinanceCosts_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel">Total finance cost</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DerecognitionOfEquityMethodInvestmentsUponDisposalOfAssociates_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Derecognition Of Equity Method Investments Upon Disposal Of Associates</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DerecognitionOfEquityMethodInvestmentsUponDisposalOfAssociates_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Derecognition of equity method investments upon disposal of associates.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DerecognitionOfEquityMethodInvestmentsUponDisposalOfAssociates_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">De-recognition of equity method investments upon disposal of associates</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_SCTubularSolutionsBSdnBhdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">SC Tubular Solutions (B) Sdn. Bhd.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_SCTubularSolutionsBSdnBhdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">SC Tubular Solutions (B) Sdn. Bhd. [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_SCTubularSolutionsBSdnBhdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">SC Tubular Solutions (B) Sdn. Bhd. [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DeferredTaxAssetsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Deferred tax assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DeferredTaxAssetsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred tax assets [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DeferredTaxAssetsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Deferred tax assets.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_FinancialAssetsAtAmortisedCostCategoryMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Financial Assets at Amortized Cost</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_FinancialAssetsAtAmortisedCostCategoryMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financial assets at amortised cost, category [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ConversionOfConvertibleNotesShares_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Conversion of Convertible Notes Shares</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ConversionOfConvertibleNotesShares_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Conversion of convertible notes shares.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ConversionOfConvertibleNotesShares_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Conversion of convertible notes, shares</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ThaiBahtMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Thai Baht</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ThaiBahtMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Thai Baht [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ThaiBahtMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Thai Baht.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskProcessForInformingManagementOrCommitteesResponsibleTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Process for Informing Management or Committees Responsible [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_FinanceIncome_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finance income</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_FinanceIncome_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Total finance income</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_FinanceIncome_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Finance income - related parties</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_FinanceIncome_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Finance income</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ConversionOfConvertibleBondToShares_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Conversion Of Convertible Bond To Shares</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ConversionOfConvertibleBondToShares_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Conversion of convertible bond to shares.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ConversionOfConvertibleBondToShares_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Conversion of convertible bond</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NumberOfSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Number of shares outstanding</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NumberOfSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Beginning balance (shares)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NumberOfSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Ending balance (shares)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NumberOfSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Shares outstanding</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_OrdinarySharesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Ordinary shares [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_OrdinarySharesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Share Capital</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IncreaseDecreaseInFairValueMeasurementDueToReasonablyPossibleIncreaseInUnobservableInputLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IncreaseDecreaseInFairValueMeasurementDueToReasonablyPossibleIncreaseInUnobservableInputLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Increase (decrease) in profit</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_FinancialAssetsIndividuallyAssessedForCreditLossesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financial assets individually assessed for credit losses [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_FinancialAssetsIndividuallyAssessedForCreditLossesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Individually Impaired</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfEntitysReportableSegmentsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of entity's operating segments [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfEntitysReportableSegmentsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Segment Reporting</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of reconciliation of changes in intangible assets and goodwill [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Reconciliation of Carrying Amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_BusinessCombinationsAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business combinations [axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NoncurrentRestrictedCashAndCashEquivalents_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Non-current restricted cash and cash equivalents</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NoncurrentRestrictedCashAndCashEquivalents_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Less: Restricted cash, non-current</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NoncurrentRestrictedCashAndCashEquivalents_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Restricted cash, non-current</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityInteractiveDataCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Interactive Data Current</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="country_KY_lbl" xlink:role="http://www.xbrl.org/2003/role/label">CAYMAN ISLANDS</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="country_KY_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cayman Islands [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_BorrowingsOriginalCurrency_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Original Currency</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_BorrowingsOriginalCurrency_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Borrowings, original currency</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_FinanceCostsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Finance costs</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_FinanceCostsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finance Costs [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_FinanceCostsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Finance Costs.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_MovementInDeferredTaxLiabilitiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Movement in deferred tax liabilities [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_MovementInDeferredTaxLiabilitiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Movement in deferred tax liabilities.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_MovementInDeferredTaxLiabilitiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Movement in deferred tax liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DeferredTaxLiabilityIncludingPPAAdjustment_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Tax Liability Including PPA Adjustment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DeferredTaxLiabilityIncludingPPAAdjustment_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Deferred tax iability including PPA adjustment.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DeferredTaxLiabilityIncludingPPAAdjustment_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Beginning balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DeferredTaxLiabilityIncludingPPAAdjustment_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Ending balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ChangesInOperatingAssetsAndLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Changes In Operating Assets And Liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ChangesInOperatingAssetsAndLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Changes in operating assets and liability.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ChangesInOperatingAssetsAndLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Changes in operating assets and liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ChangesInOperatingAssetsAndLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Changes in operating assets and liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CategoriesOfFinancialLiabilitiesDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Categories of financial liabilities [domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_EffectOfChangesInForeignExchangeRates_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Effect Of Changes In Foreign Exchange Rates</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_EffectOfChangesInForeignExchangeRates_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Effect of changes in foreign exchange rates.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_EffectOfChangesInForeignExchangeRates_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Effect of changes in foreign exchange rates</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_EffectOfChangesInForeignExchangeRates_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Effect of changes in foreign exchange rates</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DepreciationRightofuseAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Depreciation, right-of-use assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DepreciationRightofuseAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Depreciation of right-of-use assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DepreciationRightofuseAssets_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Depreciation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DepreciationRightofuseAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Depreciation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_TaxRateEffectOfExpenseNotDeductibleInDeterminingTaxableProfitTaxLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Tax rate effect of expense not deductible in determining taxable profit (tax loss)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_TaxRateEffectOfExpenseNotDeductibleInDeterminingTaxableProfitTaxLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Non-deductible expenses (Percentage)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForFunctionalCurrencyExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Description of accounting policy for functional currency [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForFunctionalCurrencyExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Functional and presentation currency</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_RevenueAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Revenue [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfTermsAndDebtRepaymentScheduleTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of terms and debt repayment schedule [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfTermsAndDebtRepaymentScheduleTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Disclosure of terms and debt repayment schedule explanatory.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfTermsAndDebtRepaymentScheduleTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Terms and Debt Repayment Schedule</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ProceedsFromSalesOfInvestmentsAccountedForUsingEquityMethod_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Proceeds from disposal of equity method investments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ProceedsFromSalesOfInvestmentsAccountedForUsingEquityMethod_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Proceeds from sales of investments accounted for using equity method</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_TypesOfCustomersAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Types of customers [axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForFinancialInstrumentsAtFairValueThroughProfitOrLossExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Description of accounting policy for financial instruments at fair value through profit or loss [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForFinancialInstrumentsAtFairValueThroughProfitOrLossExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Recognition and initial measurement</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfDetailedInformationAboutRestrictedCashAndCashEquivalentExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Restricted Cash</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfDetailedInformationAboutRestrictedCashAndCashEquivalentExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure Of Detailed Information About Restricted Cash And Cash Equivalent Explanatory</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfDetailedInformationAboutRestrictedCashAndCashEquivalentExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Disclosure Of Detailed Information About Restricted Cash And Cash Equivalent Explanatory.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_IndonesianRupiahMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Indonesian Rupiah</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_IndonesianRupiahMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Indonesian Rupiah [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_IndonesianRupiahMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Indonesian Rupiah.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of reconciliation of liabilities arising from financing activities [line items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfAttributionOfExpensesByNatureToTheirFunctionLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of attribution of expenses by nature to their function [line items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForDeferredIncomeTaxExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Income Taxes</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForDeferredIncomeTaxExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Description of accounting policy for deferred income tax [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IncreaseDecreaseInDefinedBenefitObligationDueToReasonablyPossibleDecreaseInActuarialAssumption_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IncreaseDecreaseInDefinedBenefitObligationDueToReasonablyPossibleDecreaseInActuarialAssumption_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Discount Rate 1% decrease</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ChangeInDefinedBenefitObligationDueToReasonablyPossibleDecreaseInActuarialAssumptionOnFutureSalaryGrowth_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Change In Defined Benefit Obligation Due To Reasonably Possible Decrease In Actuarial Assumption On Future Salary Growth</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ChangeInDefinedBenefitObligationDueToReasonablyPossibleDecreaseInActuarialAssumptionOnFutureSalaryGrowth_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Change in defined benefit obligation due to reasonably possible decrease in actuarial assumption on future salary growth.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ChangeInDefinedBenefitObligationDueToReasonablyPossibleDecreaseInActuarialAssumptionOnFutureSalaryGrowth_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Salary growth rate 1% decrease</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_MarketsOfCustomersAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Markets of customers [axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ClassesOfFinancialInstrumentsAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Classes of financial instruments [axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ForeignCurrencyExposure_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Net exposure</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ForeignCurrencyExposure_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Foreign Currency Exposure</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ForeignCurrencyExposure_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Foreign currency exposure</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Payment of lease liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Payments of lease liabilities, classified as financing activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel">Total cash outflow for leases</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Total cash outflow for leases</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel">Payments of lease liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_RepaymentFromLoanToRelatedParties_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Repayment from/(loan to) related parties</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_RepaymentFromLoanToRelatedParties_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Repayment from/(loan to) related parties.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_RepaymentFromLoanToRelatedParties_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Repayment from/(loan to) related parties</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfInitialApplicationOfStandardsOrInterpretations_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of initial application of standards or interpretations [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfInitialApplicationOfStandardsOrInterpretations_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Statement of compliance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of detailed information about property, plant and equipment [line items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_LeaseLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lease liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_LeaseLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total lease liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IncreaseDecreaseInDefinedBenefitObligationDueToReasonablyPossibleIncreaseInActuarialAssumption_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IncreaseDecreaseInDefinedBenefitObligationDueToReasonablyPossibleIncreaseInActuarialAssumption_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Discount rate 1% Increase</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_OwnershipDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Ownership [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ProfitLossAttributableToOwnersOfParent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Profit (loss), attributable to owners of parent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ProfitLossAttributableToOwnersOfParent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Shareholders of the Company</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ProfitLossAttributableToOwnersOfParent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Profits for the year attributable to shareholders</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ProfitLossAttributableToOwnersOfParent_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Profits for the year attributable to shareholders</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ComprehensiveIncomeAttributableToOwnersOfParent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Shareholders of the Company</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ComprehensiveIncomeAttributableToOwnersOfParent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Comprehensive income, attributable to owners of parent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ComprehensiveIncomeAttributableToOwnersOfParent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total comprehensive income, attributable to owners of parent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfPrepaymentsAndOtherAssetsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of prepayments and other assets [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfPrepaymentsAndOtherAssetsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Prepayment and Other Assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfNonfinancialAssetsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Non-financial assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfNonfinancialAssetsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Description of accounting policy for impairment of non-financial assets [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_IncreaseInDefinedBenefitObligationDueToDecreaseInActuarialAssumptionOfDiscountRate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase In Defined Benefit Obligation Due To Decrease In Actuarial Assumption Of Discount Rate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_IncreaseInDefinedBenefitObligationDueToDecreaseInActuarialAssumptionOfDiscountRate_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Increase in defined benefit obligation due to decrease in actuarial assumption of discount rate.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_IncreaseInDefinedBenefitObligationDueToDecreaseInActuarialAssumptionOfDiscountRate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Discount Rate 1% decrease</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfQuantitativeInformationAboutRightofuseAssetsLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of quantitative information about right-of-use assets [line items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_CustomerOneMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Customer one.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_CustomerOneMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Customer One [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_CustomerOneMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Customer One</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OrganizationAndPrincipalActivitiesTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Organization and principal activities [table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OrganizationAndPrincipalActivitiesTable_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Organization and principal activities.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_TradeAndOtherPayablesToTradeSuppliers_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Trade payables</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_TradeAndOtherPayablesToTradeSuppliers_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Trade payables</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_TradeAndOtherPayablesToTradeSuppliers_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Trade payables</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of transactions between related parties [line items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressCityOrTown_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Address, City or Town</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfClassesOfShareCapitalExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of classes of share capital [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfClassesOfShareCapitalExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Share Capital</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_LeaseLiabilitiesMaturity_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lease Liabilities, Maturity</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_LeaseLiabilitiesMaturity_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Lease liabilities, maturity.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_LeaseLiabilitiesMaturity_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Lease liabilities, Year of Maturity</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_AuditorLocation_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Auditor Location</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskMateriallyAffectedOrReasonablyLikelyToMateriallyAffectRegistrantFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Flag]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AccountingProfit_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accounting profit</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AccountingProfit_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Profit before tax</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_BorrowingsInterestRateBasis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Borrowings, interest rate basis</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_BorrowingsInterestRateBasis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Interest rate basis</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForFairValueMeasurementExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Description of accounting policy for fair value measurement [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForFairValueMeasurementExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Measurement of fair value</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ConversionOfConvertibleNotesToShares_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Conversion Of Convertible Notes To Shares</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ConversionOfConvertibleNotesToShares_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Conversion of convertible notes to shares.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ConversionOfConvertibleNotesToShares_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">No. of shares, Conversion of convertible notes</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Effect of exchange rate changes on cash and cash equivalents</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Effect of foreign exchange on cash, cash equivalents and restricted cash</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_RestatedMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Currently stated [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_PastServiceCostDefinedBenefitPlans_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Past service cost</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_PastServiceCostDefinedBenefitPlans_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Past service cost, defined benefit plans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CashFlowsFromUsedInDecreaseIncreaseInRestrictedCashAndCashEquivalents_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash flows from (used in) decrease (increase) in restricted cash and cash equivalents</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CashFlowsFromUsedInDecreaseIncreaseInRestrictedCashAndCashEquivalents_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Net increase/(decrease) in cash, cash equivalents and restricted cash</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CashFlowsFromUsedInDecreaseIncreaseInRestrictedCashAndCashEquivalents_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net cash provided by operating activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfEffectOfChangesInForeignExchangeRatesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of effect of changes in foreign exchange rates [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfEffectOfChangesInForeignExchangeRatesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Summary of Effect of Changes in Foreign Exchange Rates</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_BalancesWithBanks_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash in bank</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_BalancesWithBanks_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Balances with banks</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_LegacyCashPoolingArrangementPrincipalBalance_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Legacy cash pooling arrangement principal balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_LegacyCashPoolingArrangementPrincipalBalance_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Legacy cash pooling arrangement principal balance.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_LegacyCashPoolingArrangementPrincipalBalance_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Legacy cash pooling arrangement principal balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_TradeAndOtherCurrentPayables_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total trade and other current payables</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_TradeAndOtherCurrentPayables_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Trade and other current payables</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_TradeAndOtherCurrentPayables_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Trade and other payables</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ImpairmentLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Impairment loss</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ImpairmentLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Impairment loss recognized</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskThirdPartyOversightAndIdentificationProcessesFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Third Party Oversight and Identification Processes [Flag]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfFinancialInstrumentsLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of detailed information about financial instruments [line items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_FixedDepositsPlacedAsCollateral_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fixed Deposits Placed as Collateral</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_FixedDepositsPlacedAsCollateral_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Fixed deposits placed as collateral.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DilutiveEffectOfIssuableSharesOnWeightedAverageNumberOfOrdinaryShares_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Dilutive Effect Of Issuable Shares On Weighted Average Number Of Ordinary Shares</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DilutiveEffectOfIssuableSharesOnWeightedAverageNumberOfOrdinaryShares_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Dilutive effect of issuable shares on weighted average number of ordinary shares.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DilutiveEffectOfIssuableSharesOnWeightedAverageNumberOfOrdinaryShares_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Issued ordinary shares at the beginning of year/period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DilutiveEffectOfIssuableSharesOnWeightedAverageNumberOfOrdinaryShares_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Weighted-average number of ordinary shares at the end of year/period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DilutiveEffectOfIssuableSharesOnWeightedAverageNumberOfOrdinaryShares_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Issued ordinary shares for the period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskManagementPositionsOrCommitteesResponsibleReportToBoardFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Management Positions or Committees Responsible Report to Board [Flag]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Classes of property, plant and equipment [domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfSignificantActuarialAssumptionsUsedInActuarialCalculationsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Significant Actuarial Assumptions used in Actuarial Calculations</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfSignificantActuarialAssumptionsUsedInActuarialCalculationsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of Significant Actuarial Assumptions used in Actuarial Calculations Explanatory</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfSignificantActuarialAssumptionsUsedInActuarialCalculationsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Summary of significant actuarial assumptions used in actuarial calculations.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_InterestExpenseOnOtherFinancialLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest expense on other financial liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_InterestExpenseOnOtherFinancialLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Interest expenses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_InterestExpensesFromEmployeesDefinedBenefitsObligation_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest Expenses From Employees Defined Benefits Obligation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_InterestExpensesFromEmployeesDefinedBenefitsObligation_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Interest expenses from employees defined benefits obligation.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_InterestExpensesFromEmployeesDefinedBenefitsObligation_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Interest expenses from employees' defined benefits obligation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_SumitomoCorporationCapitalAsiaPteLtdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Sumitomo Corporation Capital Asia Pte. Ltd.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_SumitomoCorporationCapitalAsiaPteLtdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Sumitomo Corporation Capital Asia Pte. Ltd. [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_SumitomoCorporationCapitalAsiaPteLtdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Sumitomo Corporation Capital Asia Pte. Ltd. member.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForRestrictedCashAndCashEquivalentsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Description of accounting policy for restricted cash and cash equivalents [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForRestrictedCashAndCashEquivalentsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash and cash equivalents</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IncreaseThroughNewLeasesLiabilitiesArisingFromFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase through new leases, liabilities arising from financing activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IncreaseThroughNewLeasesLiabilitiesArisingFromFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Recognition of lease liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IncreaseThroughNewLeasesLiabilitiesArisingFromFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Payment of lease liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfAccountingJudgementsAndEstimatesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of accounting judgements and estimates [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfAccountingJudgementsAndEstimatesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Use of estimates and judgements</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CurrentTradeReceivables_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Trade receivables</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CurrentTradeReceivables_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Current trade receivables</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CurrentTradeReceivables_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total trade receivables</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_LoansAndBorrowingsArisingFromFinancingActivitiesBeginningBalance_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Loans And Borrowings Arising From Financing Activities Beginning Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_LoansAndBorrowingsArisingFromFinancingActivitiesBeginningBalance_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Loans And Borrowings Arising From Financing Activities Beginning Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_LoansAndBorrowingsArisingFromFinancingActivitiesBeginningBalance_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Loans and borrowings beginning balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CategoriesOfRelatedPartiesAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Categories of related parties [axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ThirdPartiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Third parties</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ThirdPartiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Third parties [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ThirdPartiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Third parties.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfOrganizationAndPrincipalActivitiesExplanatoryTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of organization and principal activities explanatory [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfOrganizationAndPrincipalActivitiesExplanatoryTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Disclosure of organization and principal activities explanatory.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfOrganizationAndPrincipalActivitiesExplanatoryTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Organization and Principal Activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CarryingAmountMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Carrying amount [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_MovementInDeferredTaxBalancesTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Movement in deferred tax balances [table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_MovementInDeferredTaxBalancesTable_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Movement in deferred tax balances.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IncreaseDecreaseThroughTransactionsWithOwners_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase (decrease) through transactions with owners, equity</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IncreaseDecreaseThroughTransactionsWithOwners_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total transactions with owners of the Company</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_LeaseLiabilitiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Lease Liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_LeaseLiabilitiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lease liabilities [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfTradeReceivablesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure Of Trade Receivables Explanatory</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfTradeReceivablesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Disclosure Of Trade Receivables Explanatory</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfTradeReceivablesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Trade Receivables</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfTradeReceivablesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Summary of Trade Receivables</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DeferredTaxAssetsNotRecognizedAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred tax assets not recognized [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DeferredTaxAssetsNotRecognizedAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Deferred tax assets not recognized.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DeferredTaxAssetsNotRecognizedAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Deferred tax assets not recognized</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfBusinessCombinationsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Business Combination</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfBusinessCombinationsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of business combinations [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_PYOiltoolsSdnBhdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">PY Oiltools Sdn Bhd,</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_PYOiltoolsSdnBhdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">PY Oiltools Sdn Bhd [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_PYOiltoolsSdnBhdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">PY Oiltools Sdn Bhd.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfCreditRiskExposureLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of credit risk exposure [line items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentType_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Type</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_OtherIncome_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Others</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_OtherIncome_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other income</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ComputerSoftwareMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Computer software [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ComputerSoftwareMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Software</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesIntangibleAssetsAndGoodwill_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase (decrease) through net exchange differences, intangible assets and goodwill</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesIntangibleAssetsAndGoodwill_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Effect of movements in exchange rates</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_AllowanceForCreditLossesAmountsWrittenOff_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Allowance For Credit Losses Amounts Written Off</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_AllowanceForCreditLossesAmountsWrittenOff_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Allowance for credit losses amounts written off.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_AllowanceForCreditLossesAmountsWrittenOff_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Amounts written off</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_Security12bTitle_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Title of 12(b) Security</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfAmountsRecognizedInStatementsOfCashFlowsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Amounts Recognized in Statement of Cash Flows</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfAmountsRecognizedInStatementsOfCashFlowsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of amounts recognized in statements of cash flows explanatory</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfAmountsRecognizedInStatementsOfCashFlowsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Disclosure of amounts recognized in statements of cash flows explanatory.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CashOutflowForLeases_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash outflow for leases</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CashOutflowForLeases_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Total cash outflow for leases</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_EarningsPerShareExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Earnings per share [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_EarningsPerShareExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Calculation of Basic and Diluted Earnings Per Share</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NameOfSubsidiary_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Name of subsidiary</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NameOfSubsidiary_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_RFDynamicFundAndVielinkAsiaPteLtdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">RF Dynamic Fund and Vielink Asia Pte Ltd [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_RFDynamicFundAndVielinkAsiaPteLtdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">RF Dynamic Fund and Vielink Asia Pte Ltd.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_RFDynamicFundAndVielinkAsiaPteLtdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">RFWM VCC</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other comprehensive income, net of tax, gains (losses) on remeasurements of defined benefit plans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total other comprehensive income, net of tax, gains (losses) on remeasurements of defined benefit plans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Defined benefit plan remeasurements</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Changes resulting from actuarial remeasurement of employee benefits oligation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CashFlowsFromUsedInOperatingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash flows from (used in) operating activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CashFlowsFromUsedInOperatingActivities_lbl" xlink:role="http://www.xbrl.org/2009/role/netLabel">Net cash flows from (used in) operating activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CashFlowsFromUsedInOperatingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Net cash provided by/(used in) operating activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CashFlowsFromUsedInOperatingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net cash provided by operating activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_CapitalContribution_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Capital contribution</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_CapitalContribution_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Capital Contribution</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_CapitalContribution_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Capital contribution.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentFiscalPeriodFocus_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Fiscal Period Focus</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of non-adjusting events after reporting period [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_RawMaterials_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Current raw materials</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_RawMaterials_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Raw Materials</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_GainRecognisedInBargainPurchaseTransaction_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Gain recognised in bargain purchase transaction</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_GainRecognisedInBargainPurchaseTransaction_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Gain on bargain purchase</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_GainRecognisedInBargainPurchaseTransaction_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Bargain purchase gain</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_GainRecognisedInBargainPurchaseTransaction_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Gain on bargain purchase</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_GainRecognisedInBargainPurchaseTransaction_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Bargain purchase gain</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_BankBorrowingsUndiscountedCashFlows_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Bank borrowings, undiscounted cash flows</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_BankBorrowingsUndiscountedCashFlows_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Loans and borrowings</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ProductsAndServicesDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Products and services [domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ForeignCurrencyExposureTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Foreign Currency Exposure [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ForeignCurrencyExposureTable_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Foreign currency exposure.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfContingentLiabilitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of contingent liabilities [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of transactions between related parties [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_AddressTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Address Type [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ClassesOfFinancialInstrumentsDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Classes of financial instruments [domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ChangesInNetDefinedBenefitLiabilityAssetResultingFromExpenseIncomeInProfitOrLossAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Changes in net defined benefit liability (asset) resulting from expense (income) in profit or loss [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AdjustmentsForFinanceIncome_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Adjustments for finance income</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AdjustmentsForFinanceIncome_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Finance income</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_LoanFromFormerRelatedPartyMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Loan From Former Related Party</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_LoanFromFormerRelatedPartyMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Loan From Former Related Party [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_LoanFromFormerRelatedPartyMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Loan From Former Related Party.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfCashAndCashEquivalentsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of cash and cash equivalents [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfCashAndCashEquivalentsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash and Cash Equivalents</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of disaggregation of revenue from contracts with customers [table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_TypesOfRisksDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Types of risks [domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CashOnHand_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash on hand</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CashOnHand_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash on hand</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_TradeAndOtherReceivablesDueFromRelatedParties_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Receivables due from related parties</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_TradeAndOtherReceivablesDueFromRelatedParties_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Amount due from a related party</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AmountsReceivableRelatedPartyTransactions_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Amounts receivable, related party transactions</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AmountsReceivableRelatedPartyTransactions_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Amount due from a related party</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NoncurrentAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Non-current assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NoncurrentAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total Non-Current Assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NoncurrentAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Total Non-Current Assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForFinancialAssetsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Description of accounting policy for financial assets [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForFinancialAssetsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Classification and subsequent measurement</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AdjustmentsForLossesGainsOnDisposalOfNoncurrentAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Adjustments for losses (gains) on disposal of non-current assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AdjustmentsForLossesGainsOnDisposalOfNoncurrentAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Loss/(gain) on disposal of property, plant and equipment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AdjustmentsForLossesGainsOnDisposalOfNoncurrentAssets_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">(Loss)/gain from disposal of property, plant and equipment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Unused tax losses for which no deferred tax asset recognised</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Tax losses with expiry in 2025</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisposalsAndRetirementsIntangibleAssetsAndGoodwill_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disposals and retirements, intangible assets and goodwill</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisposalsAndRetirementsIntangibleAssetsAndGoodwill_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel">Total disposals and retirements, intangible assets and goodwill</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisposalsAndRetirementsIntangibleAssetsAndGoodwill_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Disposals</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisposalsAndRetirementsIntangibleAssetsAndGoodwill_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Disposals</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_FreightCharges_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Freight charges</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_FreightCharges_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Freight charges.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_FinanceCostsDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finance Costs Disclosure [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_FinanceCostsDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Finance Costs Disclosure.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_TypesOfRisksAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Types of risks [axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ClassAOrdinarySharesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Class A Ordinary Shares [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ClassAOrdinarySharesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Class A Ordinary Shares.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ClassAOrdinarySharesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Class A Ordinary Shares</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_MovementInDeferredTaxBalanceLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Movement in deferred tax balance [line items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_MovementInDeferredTaxBalanceLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Movement in deferred tax balance.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfNatureOfRelatedPartyRelationshipExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of Nature of Related Party Relationship Explanatory</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfNatureOfRelatedPartyRelationshipExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Disclosure of nature of related party relationship explanatory.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfNatureOfRelatedPartyRelationshipExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Relationship with Related Parties</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_TaxRateEffectOfRevenuesExemptFromTaxation_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Tax rate effect of revenues exempt from taxation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_TaxRateEffectOfRevenuesExemptFromTaxation_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Income not subject to tax (Percentage)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_TaxRateEffectOfRevenuesExemptFromTaxation_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Income not subject to tax (Percentage)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DilutedEarningsLossPerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Diluted earnings (loss) per share</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DilutedEarningsLossPerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total diluted earnings (loss) per share</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DilutedEarningsLossPerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Diluted earnings per share (as adjusted)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DilutedEarningsLossPerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Diluted earnings per share attributable to shareholders</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel">Purchase of property, plant and equipment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Purchase of property, plant and equipment, classified as investing activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Acquisition of property, plant and equipment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfFinanceCostExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of finance cost [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfFinanceCostExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Finance Income &amp; Costs</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_TradeAndOtherPayablesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Trade and Other Payables</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_TradeAndOtherPayablesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Trade and other payables [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_TradeAndOtherPayablesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Trade and other payables.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CashAndCashEquivalentsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash and cash equivalents [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfCreditRiskExposureTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of credit risk exposure [table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ReconciliationOfChangesInAllowanceAccountForCreditLossesOfFinancialAssetsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Reconciliation of changes in allowance account for credit losses of financial assets [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Temporary difference, unused tax losses and unused tax credits [axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_SumitomoCorporationAsiaOceaniaPteLtdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Sumitomo Corporation Asia &amp; Oceania Pte. Ltd. [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_SumitomoCorporationAsiaOceaniaPteLtdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Sumitomo Corporation Asia &amp; Oceania Pte. Ltd. member.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_SumitomoCorporationAsiaOceaniaPteLtdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Sumitomo Corporation Asia &amp; Oceania Pte. Ltd.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DividendsReceivedFromInvestmentsAccountedForUsingEquityMethodClassifiedAsInvestingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Dividends received from investments accounted for using equity method, classified as investing activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DividendsReceivedFromInvestmentsAccountedForUsingEquityMethodClassifiedAsInvestingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Dividends received from equity method investments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_TradeAndOtherPayables_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total trade and other payables</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_TradeAndOtherPayables_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Trade and other payables</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskManagementStrategyAndGovernanceAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Management, Strategy, and Governance [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_OwnershipAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Ownership [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_InterestIncomeOnLoansAndAdvancesToBanks_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest income on loans and advances to banks</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_InterestIncomeOnLoansAndAdvancesToBanks_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Interest income from banks</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="country_ID_lbl" xlink:role="http://www.xbrl.org/2003/role/label">INDONESIA</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="country_ID_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Indonesia</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of temporary difference, unused tax losses and unused tax credits [line items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ExpenseRelatingToLeasesOfLowvalueAssetsForWhichRecognitionExemptionHasBeenUsed_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Expense relating to leases of low-value assets for which recognition exemption has been used</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ExpenseRelatingToLeasesOfLowvalueAssetsForWhichRecognitionExemptionHasBeenUsed_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Expenses relating to short-term lease and low value assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ExpenseRelatingToLeasesOfLowvalueAssetsForWhichRecognitionExemptionHasBeenUsed_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Expenses relating to short-term lease and low value assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentAccountingStandard_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Accounting Standard</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_SharesAuthorised_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Authorized share capital amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_SharesAuthorised_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Shares Authorised</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_SharesAuthorised_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Shares Authorised.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_TopOfRangeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Top of range [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_TopOfRangeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Top of Range</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_FinishedGoods_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Current finished goods</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_FinishedGoods_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Finished goods</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CurrentLiabilitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Current Liabilities:</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CurrentLiabilitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Current liabilities [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfContingentLiabilitiesLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of contingent liabilities [line items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ApplicableTaxRate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Applicable tax rate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ApplicableTaxRate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Income tax rate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ApplicableTaxRate_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Computed tax expense with Singapore statutory tax rate (Percentage)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfNetDefinedBenefitLiabilityAssetTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of net defined benefit liability (asset) [table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CurrentLeaseLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Current lease liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CurrentLeaseLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Lease liabilities, current</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CurrentLeaseLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Lease liabilities - current</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfPropertyPlantAndEquipmentExplanatoryTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure Of Property Plant And Equipment Explanatory [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfPropertyPlantAndEquipmentExplanatoryTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Disclosure of property plant and equipment explanatory.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfPropertyPlantAndEquipmentExplanatoryTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Estimated Useful Life for Current and Comparative Years</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_LaterThanSixYearsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Later than six years [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_LaterThanSixYearsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Later than six years.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_LaterThanSixYearsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Thereafter</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_TransportationTravelAndAccommodation_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Transportation, travel and accommodation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_TransportationTravelAndAccommodation_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Transportation, travel and accommodation.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentPeriodEndDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Period End Date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretations_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of expected impact of initial application of new standards or interpretations [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretations_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Adoption of new accounting policies</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_SharePremium_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share premium</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_SharePremium_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Share premium</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_IcfrAuditorAttestationFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/label">ICFR Auditor Attestation Flag</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_OtherNoncurrentPayables_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other payables, non-current</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_TaxEffectOfExpenseNotDeductibleInDeterminingTaxableProfitTaxLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Non-deductible expenses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_BorrowingsByNameAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Borrowings by name [axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_IncomeStatementTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Income statement [table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_IncomeStatementTable_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Income statement.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_TransactionsWithOwnersOfTheCompanyAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Transactions with owners of the Company:</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_TransactionsWithOwnersOfTheCompanyAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Transactions with Owners of the Company [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_TransactionsWithOwnersOfTheCompanyAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Transactions with owners of the company.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AdjustedWeightedAverageShares_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Diluted weighted-average shares outstanding</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AdjustedWeightedAverageShares_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Weighted average number of ordinary shares used in calculating diluted earnings per share</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AdjustedWeightedAverageShares_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Weighted-average number of ordinary shares at the end of year/period, Diluted</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisposalsRightofuseAssets_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Disposals</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisposalsRightofuseAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disposals, right-of-use assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NoncurrentAssetsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Non-current assets [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NoncurrentAssetsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Non-current assets:</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_TaxAdjustmentOfPreviousYearsAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Tax adjustment of previous years amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_TaxAdjustmentOfPreviousYearsAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Tax adjustment of previous years amount.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_TaxAdjustmentOfPreviousYearsAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Tax adjustment of previous years</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_TradingSymbol_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Trading Symbol</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfDetailedInformationAboutAmountsRecognizedInProfitOrLossTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of Detailed Information About Amounts Recognized in Profit or Loss [Table Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfDetailedInformationAboutAmountsRecognizedInProfitOrLossTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Disclosure of Detailed Information About Amounts Recognized in Profit or Loss.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfDetailedInformationAboutAmountsRecognizedInProfitOrLossTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Amounts Recognized in Profit or Loss</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfAmountDueFromRelatedPartyExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure Of Amount Due From Related Party Explanatory</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfAmountDueFromRelatedPartyExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Disclosure of amount due from related party explanatory.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfAmountDueFromRelatedPartyExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Amount Due from a Related Party</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_ContactPersonnelName_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Contact Personnel Name</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ProfitLossAttributableToNoncontrollingInterests_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Profit (loss), attributable to non-controlling interests</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ProfitLossAttributableToNoncontrollingInterests_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Non-controlling interests</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ProfitLossAttributableToNoncontrollingInterests_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Less: Gain attributable to non-controlling interests</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ProfitLossAttributableToNoncontrollingInterests_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Less: Gain attributable to non-controlling interests</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ComprehensiveIncomeAttributableToAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Comprehensive income attributable to [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ComprehensiveIncomeAttributableToAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Total comprehensive income attributable to:</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CurrentPrepayments_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Current prepayments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CurrentPrepayments_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total current prepayments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CurrentPrepayments_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Prepayment, current</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IncreaseDecreaseThroughCumulativeCatchupAdjustmentsToRevenueContractAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase (decrease) through cumulative catch-up adjustments to revenue, contract assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IncreaseDecreaseThroughCumulativeCatchupAdjustmentsToRevenueContractAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Recognized as revenue</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_FinancialEffectOfCorrectionsOfAccountingErrorsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase (decrease) due to corrections of prior period errors [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_FinancialEffectOfCorrectionsOfAccountingErrorsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Adjustments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_InventoryRecognisedAsOfAcquisitionDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Inventory recognised as of acquisition date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_InventoryRecognisedAsOfAcquisitionDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Inventories</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_LeasePeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lease period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_LeasePeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Lease period.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_LeasePeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Lease period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfGeographicalAreasTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of geographical areas [table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ProfitLossBeforeTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Profit (loss) before tax</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ProfitLossBeforeTax_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Profit before tax</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ProfitLossBeforeTax_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Profit before tax</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Proceeds from loans and borrowings</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Proceeds from borrowings</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Proceeds from borrowings, classified as financing activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfChangesInAccountingEstimatesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of changes in accounting estimates [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OthersMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Others [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OthersMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Others.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OthersMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Others</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CurrentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Current</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CurrentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Current [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskManagementExpertiseOfManagementResponsibleTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Management Expertise of Management Responsible [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_GrossProfit_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Gross profit</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_GrossProfit_lbl" xlink:role="http://www.xbrl.org/2009/role/netLabel">Gross profit</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_GrossProfit_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Gross profit</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of disaggregation of revenue from contracts with customers [line items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ActuarialAssumptionOfDiscountRates_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Actuarial assumption of discount rates</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ActuarialAssumptionOfDiscountRates_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Discount rate (per annum)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfDetailedInformationAboutDetailsOfSubsidiariesExplanatoryTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of detailed information about details of subsidiaries explanatory [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfDetailedInformationAboutDetailsOfSubsidiariesExplanatoryTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Disclosure of detailed information about details of subsidiaries explanatory.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfDetailedInformationAboutDetailsOfSubsidiariesExplanatoryTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Detailed Information About Details of Subsidiaries</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ForeignCurrencyExposureLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Foreign Currency Exposure [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ForeignCurrencyExposureLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Foreign currency exposure.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfQuantitativeInformationAboutRightofuseAssetsTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of quantitative information about right-of-use assets [table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_StatementGeographicalAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Geographical [Axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_WorkInProgress_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Current work in progress</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_WorkInProgress_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Work-in-progress</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ContractAssetsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Contract assets [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_CapitalAdvancesFromPotentialInvestors_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Capital advances from potential investors</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_CapitalAdvancesFromPotentialInvestors_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Capital advances from potential investors.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_CapitalAdvancesFromPotentialInvestors_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Advances from potential investors</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfCashAndCashEquivalentsDescriptionExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure Of Cash And Cash Equivalents Description Explanatory</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfCashAndCashEquivalentsDescriptionExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Disclosure Of Cash And Cash Equivalents Description Explanatory.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfCashAndCashEquivalentsDescriptionExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Cash and Cash Equivalents</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_LiabilityAssetOfDefinedBenefitPlans_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Net defined benefit liability (asset)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_LiabilityAssetOfDefinedBenefitPlans_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Net defined benefit liability (asset) at beginning of period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_LiabilityAssetOfDefinedBenefitPlans_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Net defined benefit liability (asset) at end of period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IssuedCapitalMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Issued capital [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IssuedCapitalMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Share Capital</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IntangibleAssetsAndGoodwillAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Intangible assets and goodwill [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_TaxEffectOfTaxLosses_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Tax effect of tax losses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_TaxEffectOfTaxLosses_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Tax effect of unrecognized loss</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_SignificantInvestmentsInSubsidiariesDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Subsidiaries [domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_Equity_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equity</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_Equity_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total equity</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_Equity_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Beginning balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_Equity_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Ending balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_Equity_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Total equity</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForDepreciationExpenseExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Depreciation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForDepreciationExpenseExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Description of accounting policy for depreciation expense [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CreditImpairmentOfFinancialInstrumentsAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Credit impairment of financial instruments [axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_SecurityExchangeName_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Security Exchange Name</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Temporary difference, unused tax losses and unused tax credits [domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_TaxRateEffectOfTaxLosses_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Tax rate effect of tax losses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_TaxRateEffectOfTaxLosses_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Tax effect of unrecognized loss (Percentage)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_BorrowingsInterestRate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Interest rate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_BorrowingsInterestRate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Borrowings, interest rate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Amounts Recognized in Profit or Loss</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of analysis of other comprehensive income by item [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ExplanationOfSignificantChangesInContractAssetsAndContractLiabilitiesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Contract Assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ExplanationOfSignificantChangesInContractAssetsAndContractLiabilitiesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Explanation of significant changes in contract assets and contract liabilities [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_LaterThanFourYearsAndNotLaterThanFiveYearsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Later than four years and not later than five years [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_LaterThanFourYearsAndNotLaterThanFiveYearsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Later Than Four Years and Not Later Than Five Years</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_LaterThanFourYearsAndNotLaterThanFiveYearsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2029</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IncomeStatementAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Profit or loss [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_RetrospectiveApplicationAndRetrospectiveRestatementAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Retrospective application and retrospective restatement [axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OrganizationAndPrincipalActivitiesLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Organization and principal activities [line items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OrganizationAndPrincipalActivitiesLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Organization and principal activities.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_Liability-RelatedOtherChanges_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Liability-related other changes</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_Liability-RelatedOtherChanges_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Liability-related other changes.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_Liability-RelatedOtherChanges_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total liability-related other changes</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_AditionalPaymentOnEquityMethodInvestmentsRecognizedAsCapitalInjection_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Aditional payment on equity method investments recognized as capital injection</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_AditionalPaymentOnEquityMethodInvestmentsRecognizedAsCapitalInjection_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Aditional payment on equity method investments recognized as capital injection.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_CashCashEquivalentsAndCashRestrictedCash_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash, Cash Equivalents And Cash Restricted Cash</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_CashCashEquivalentsAndCashRestrictedCash_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The amount of cash, cash and cash equivalents whose use or withdrawal is restricted.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_CashCashEquivalentsAndCashRestrictedCash_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Cash, cash equivalents and restricted cash at end of year/period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_CashCashEquivalentsAndCashRestrictedCash_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Cash, cash equivalents and restricted cash at beginning of year/period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_UnusedTaxLossesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Unused tax losses [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_UnusedTaxLossesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net Operating Losses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ProductsAndServicesAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Products and services [axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfMaturityAnalysisForNonderivativeFinancialLiabilitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of maturity analysis for non-derivative financial liabilities [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CurrentAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Current assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CurrentAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total Current Assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_InterestRateRiskMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Interest Rate Risk</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_InterestRateRiskMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest rate risk [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_LessThanOneMonthMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Less Than One Month [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_LessThanOneMonthMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Less than one month.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_LessThanOneMonthMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Less Than 30 Days Past Due</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of detailed information about borrowings [line items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_LiabilitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_LiabilitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Liabilities [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IdentifiableAssetsAcquiredLiabilitiesAssumed_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Fair value of net assets acquired</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IdentifiableAssetsAcquiredLiabilitiesAssumed_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Identifiable assets acquired (liabilities assumed)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IdentifiableAssetsAcquiredLiabilitiesAssumed_lbl" xlink:role="http://www.xbrl.org/2009/role/netLabel">Net identifiable assets acquired (liabilities assumed)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityExTransitionPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Ex Transition Period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of reconciliation of changes in intangible assets and goodwill [line items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Classes of property, plant and equipment [axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_InterestExpenseOnLeaseLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest expense on lease liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_InterestExpenseOnLeaseLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Interest on lease liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_InterestExpenseOnLeaseLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Interest expenses from lease liability</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_InterestExpenseOnLeaseLiabilities_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Interest on lease liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_MaterialAccountingPoliciesDetailsTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Material accounting policies details [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_MaterialAccountingPoliciesDetailsTable_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Material accounting policies details.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AdditionsToRightofuseAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Additions to right-of-use assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AdditionsToRightofuseAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Additions</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of detailed information about borrowings [table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ShorttermDepositsClassifiedAsCashEquivalents_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Time deposits</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ShorttermDepositsClassifiedAsCashEquivalents_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Short-term deposits, classified as cash equivalents</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfReconciliationOfChangesInIntangibleAssetsOtherThanGoodwillTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of reconciliation of changes in intangible assets other than goodwill [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfReconciliationOfChangesInIntangibleAssetsOtherThanGoodwillTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Disclosure of reconciliation of changes in intangible assets other than goodwill.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfReconciliationOfChangesInIntangibleAssetsOtherThanGoodwillTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Reconciliation of Carrying Amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_SignificantInvestmentsInSubsidiariesAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Subsidiaries [axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_SumitomoCorporationMalaysiaSdnBhdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Sumitomo Corporation Malaysia Sdn. Bhd. [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_SumitomoCorporationMalaysiaSdnBhdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Sumitomo Corporation Malaysia Sdn. Bhd. member.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_SumitomoCorporationMalaysiaSdnBhdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Sumitomo Corporation Malaysia Sdn. Bhd.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_TaxAdjustmentOfPreviousYearsPercent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Tax adjustment of previous years percent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_TaxAdjustmentOfPreviousYearsPercent_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Tax adjustment of previous years percent.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_TaxAdjustmentOfPreviousYearsPercent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Tax adjustment of previous years (Percentage)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OMSOilfieldServicesAustraliaPtyLtdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">OMS Oilfield Services (Australia) Pty Ltd.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OMSOilfieldServicesAustraliaPtyLtdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">OMS Oilfield Services Australia Pty Ltd. [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OMSOilfieldServicesAustraliaPtyLtdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">OMS Oilfield Services Australia Pty Ltd.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfCreditRiskExposureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of credit risk exposure [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityFilerCategory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Filer Category</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_LongtermDeposits_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Long-term deposits</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_LongtermDeposits_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Deposits, non-current</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AdjustmentsForUndistributedProfitsOfAssociates_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Adjustments for undistributed profits of associates</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AdjustmentsForUndistributedProfitsOfAssociates_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Adjustments for undistributed profits of associates</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_BargainPurchaseGainMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Bargain Purchase Gain [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_BargainPurchaseGainMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Bargain purchase gain.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_BorrowingsByNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Borrowings by name [domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_TradeAndOtherPayablesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Trade and other payables [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AccumulatedDepreciationAmortisationAndImpairmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accumulated Depreciation and Impairment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AccumulatedDepreciationAmortisationAndImpairmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accumulated depreciation, amortisation and impairment [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AccumulatedDepreciationAmortisationAndImpairmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Accumulated amortization and impairment losses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DateOfAcquisition2013_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Date of acquisition</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DateOfAcquisition2013_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Business combination, Date of acquisition</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_InterestChargedOutstandingBalances_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest Charged Outstanding Balances</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_InterestChargedOutstandingBalances_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Interest charged outstanding balances.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_InterestChargedOutstandingBalances_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Interest charged outstanding balances</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_TradeReceivablesAndOtherAssetsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Trade Receivables And Other Assets [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_TradeReceivablesAndOtherAssetsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Trade receivables and other assets.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_TradeReceivablesAndOtherAssetsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Trade Receivables And Other Assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfReservesWithinEquityTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of reserves within equity [table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_CurrentFiscalYearEndDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Current Fiscal Year End Date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DeferredTaxAssetsNotRecognized_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred tax assets not recognized</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DeferredTaxAssetsNotRecognized_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Deferred tax assets not recognized.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DeferredTaxAssetsNotRecognized_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ClassesOfLiabilitiesAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Classes of liabilities [axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DeferredTaxLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred tax liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DeferredTaxLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Deferred tax liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DeferredTaxLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Beginning balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DeferredTaxLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Ending balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NoncontrollingInterestsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Non-controlling interests [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NoncontrollingInterestsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Non-controlling Interest</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForSegmentReportingExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Description of accounting policy for segment reporting [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForSegmentReportingExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Segment reporting</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_LaterThanThreeMonthsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Later than three months [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_LaterThanThreeMonthsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Later Than 91 Days Past Due</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OrganizationAndPrincipalActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Organization and principal activities [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OrganizationAndPrincipalActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Organization and principal activities.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ComprehensiveIncomeAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Comprehensive income [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ComprehensiveIncomeAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Total comprehensive income for the period:</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AverageForeignExchangeRate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Average foreign exchange rate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="country_SG_lbl" xlink:role="http://www.xbrl.org/2003/role/label">SINGAPORE</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="country_SG_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Singapore</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAcquiree_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Description of acquiree</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAcquiree_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Description of acquiree</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IssuedCapitalOrdinaryShares_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Beginning balance</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IssuedCapitalOrdinaryShares_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Issued capital, ordinary shares</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityRegistrantName_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Registrant Name</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityRegistrantName_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Registrant Name</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AverageEffectiveTaxRate_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total average effective tax rate (Percentage)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AverageEffectiveTaxRate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Average effective tax rate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of reconciliation of changes in intangible assets and goodwill [table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_PostemploymentBenefitExpenseDefinedBenefitPlans_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Post-employment benefit expense in profit or loss, defined benefit plans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_PostemploymentBenefitExpenseDefinedBenefitPlans_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Expenses charged to statement of profit or loss</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of classes of share capital [line items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForEarningsPerShareExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Description of accounting policy for earnings per share [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForEarningsPerShareExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Earnings per share</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityEmergingGrowthCompany_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Emerging Growth Company</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_CashAndCashEquivalentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Cash and Cash Equivalents</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_CashAndCashEquivalentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash and cash equivalent [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_CashAndCashEquivalentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Cash and cash equivalent.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ClassesOfIntangibleAssetsAndGoodwillAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Classes of intangible assets and goodwill [axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CostOfInventoriesRecognisedAsExpenseDuringPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cost of inventories recognised as expense during period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CostOfInventoriesRecognisedAsExpenseDuringPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Inventories cost</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NoncurrentLiabilitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Non-current Liabilities:</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CurrentTaxExpenseIncome_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Current tax expense (income)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CurrentTaxExpenseIncome_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Current period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfDetailedInformationAboutPrepaymentsAndOtherAssetsExplanatoryTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of detailed information about prepayments and other assets explanatory [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfDetailedInformationAboutPrepaymentsAndOtherAssetsExplanatoryTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Disclosure of detailed information about prepayments and other assets explanatory.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfDetailedInformationAboutPrepaymentsAndOtherAssetsExplanatoryTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Detailed Information About Prepayments and Other Assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfMaturityAnalysisForNonderivativeFinancialLiabilitiesLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of maturity analysis for non-derivative financial liabilities [line items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_WeightedAverageSharesAndAdjustedWeightedAverageSharesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Weighted average ordinary shares used in calculating basic and diluted earnings per share [abstract]</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfGoodsOrServicesRenderedToRelatedPartiesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of Goods or Services Rendered To Related Parties Explanatory</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfGoodsOrServicesRenderedToRelatedPartiesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Disclosure of goods or services rendered to related parties explanatory.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfGoodsOrServicesRenderedToRelatedPartiesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Goods or Services Rendered to Related Parties</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_RightofuseAssetsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Right-of-use assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_RightofuseAssetsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Right-of-use assets [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfLeasesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of leases [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfLeasesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Leases</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ShorttermBorrowings_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Current borrowings</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ShorttermBorrowings_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Loans and borrowings, current</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_OtherIntangibleAssetsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other intangible assets [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_OtherIntangibleAssetsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other intangible assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfDetailedInformationAboutPropertyPlantAndEquipmentExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Reconciliation of Carrying Amount</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfDetailedInformationAboutPropertyPlantAndEquipmentExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of detailed information about property, plant and equipment [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfTradeAndOtherReceivablesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of trade and other receivables [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfTradeAndOtherReceivablesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Trade Receivables</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfTradeAndOtherReceivablesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Trade Receivables</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DeferredTaxLiabilityAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred tax liability (asset)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DeferredTaxLiabilityAsset_lbl" xlink:role="http://www.xbrl.org/2009/role/netLabel">Net deferred tax liability (asset)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DeferredTaxLiabilityAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Beginning balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DeferredTaxLiabilityAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Ending balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfInventoryAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of inventory [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfInventoryAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Disclosure of inventory.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DeferredTaxAssetsNotRecognizedPercent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred tax assets not recognized percent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DeferredTaxAssetsNotRecognizedPercent_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Deferred tax assets not recognized percent.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DeferredTaxAssetsNotRecognizedPercent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Deferred tax assets not recognized (Percentage)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_FinancialInstrumentsNotCreditimpairedMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Not Credit Impaired</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_FinancialInstrumentsNotCreditimpairedMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financial instruments not credit-impaired [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfDetailedInformationAboutFinancialInstrumentsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Financial Instruments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfDetailedInformationAboutFinancialInstrumentsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of detailed information about financial instruments [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ReversalOfAllowanceForInventoriesObsolescence_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Reversal of allowance for inventories obsolescence</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ReversalOfAllowanceForInventoriesObsolescence_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Reversal of allowance for inventories obsolescence</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ReversalOfAllowanceForInventoriesObsolescence_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Reversal of allowance for inventories obsolescence.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of reconciliation of liabilities arising from financing activities [table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_LaterThanTwoYearsAndNotLaterThanThreeYearsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Later than two years and not later than three years [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_LaterThanTwoYearsAndNotLaterThanThreeYearsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Later Than Two Years and Not Later Than Three Years</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_LaterThanTwoYearsAndNotLaterThanThreeYearsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">2027</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CurrentServiceCostNetDefinedBenefitLiabilityAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Current service cost</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CurrentServiceCostNetDefinedBenefitLiabilityAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase in net defined benefit liability (asset) resulting from current service cost</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfSellingGeneralAndAdministrativeExpenseExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of Selling General And Administrative Expense Explanatory</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfSellingGeneralAndAdministrativeExpenseExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Disclosure of Selling General And Administrative Expense Explanatory</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfSellingGeneralAndAdministrativeExpenseExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Total Selling, General and Administrative Expenses Includes Expenses of Nature</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ConvertibleNoteInterestRate_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Convertible note interest rate.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ConvertibleNoteInterestRate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Convertible note interest rate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Later than one year and not later than two years [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Later Than One Year and Not Later Than Two Years</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">2026</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AdjustmentsForFinanceCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Finance costs</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_RetainedEarnings_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Retained earnings</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_RetainedEarnings_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Retained earnings</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_RetainedEarnings_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total retained earnings</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskRoleOfManagementTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Role of Management [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_StatementOfChangesInEquityTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Statement of changes in equity [table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CountryOfIncorporationOrResidenceOfSubsidiary_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Country of incorporation of subsidiary</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CountryOfIncorporationOrResidenceOfSubsidiary_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Place of incorporation</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfDetailedInFormationAboutReconciliationOfEffectiveTaxRateExplanatoryTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Disclosure of detailed in formation about reconciliation of effective tax rate explanatory.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfDetailedInFormationAboutReconciliationOfEffectiveTaxRateExplanatoryTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Reconciliation of Effective Tax Rate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_EdgenMurrayPteLtdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Edgen Murray Pte. Ltd.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_EdgenMurrayPteLtdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Edgen Murray Pte. Ltd. [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_EdgenMurrayPteLtdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Edgen Murray Pte. Ltd. [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of reconciliation of changes in intangible assets and goodwill [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of transactions between related parties [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Transactions with Key Management Personnel</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_PastDueStatusDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Past due status [domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_CategoriesOfFinancialAssetsAndLiabilitiesTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Categories of financial assets and liabilities [Table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_CategoriesOfFinancialAssetsAndLiabilitiesTable_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Categories of financial assets and liabilities.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NoncurrentPrepayments_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Prepayment, non-current</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NoncurrentPrepayments_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Non-current prepayments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NoncurrentPrepayments_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Prepayment and other non-current assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_WagesAndSalaries_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Wages and salaries</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_WagesAndSalaries_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Staff expenses and wages</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DescriptionOfAccountingPolicyForCurrentTaxExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Description of Accounting Policy for Current Tax Explanatory</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DescriptionOfAccountingPolicyForCurrentTaxExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Description of accounting policy for current tax policy.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DescriptionOfAccountingPolicyForCurrentTaxExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Current Tax</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_MalaysianRinggitMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Malaysian Ringgit [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_MalaysianRinggitMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Malaysian Ringgit.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_MalaysianRinggitMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Malaysian Ringgit</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ShareOfProfitLossOfAssociatesAccountedForUsingEquityMethod_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Share of associates' profits during the year</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ShareOfProfitLossOfAssociatesAccountedForUsingEquityMethod_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share of profit (loss) of associates accounted for using equity method</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ShareOfProfitLossOfAssociatesAccountedForUsingEquityMethod_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Share of associates' profits received</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_SuppliesAndSubcontractingCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Supplies and subcontracting costs</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_SuppliesAndSubcontractingCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Supplies and subcontracting costs.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfIncomeAndExpensesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Income and Expenses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfIncomeAndExpensesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of Income and Expenses Explanatory</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfIncomeAndExpensesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Disclosure of Income and Expenses.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Classes of intangible assets other than goodwill [domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_TradeAndOtherPayablesLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Trade And Other Payables [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_TradeAndOtherPayablesLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Trade And Other Payables.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ChangesInLiabilitiesArisingFromFinancingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Changes in liabilities arising from financing activities [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ChangesInLiabilitiesArisingFromFinancingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Changes from financing cash flows</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ImpairmentOfFinancialAssetsAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Impairment of financial assets [axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_RelatedPartyTransactionsAmountPayableSettlementPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Related Party Transactions Amount Payable Settlement Period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_RelatedPartyTransactionsAmountPayableSettlementPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Related party transactions amount payable settlement period.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_RelatedPartyTransactionsAmountPayableSettlementPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Amounts payable, outstanding balances settlement period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CurrencyInWhichInformationIsDisplayedAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Currency in which information is displayed [axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AdjustmentsForUnrealisedForeignExchangeLossesGains_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Adjustments for unrealised foreign exchange losses (gains)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AdjustmentsForUnrealisedForeignExchangeLossesGains_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Loss/(gain) on unrealized foreign exchange</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_TaxExpenseIncomeAtApplicableTaxRate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Tax expense (income) at applicable tax rate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_TaxExpenseIncomeAtApplicableTaxRate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Computed tax expense with Singapore statutory tax rate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_TradeAndOtherReceivablesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Trade and other receivables [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ExplanationOfFinancialEffectOfAdjustmentsRelatedToBusinessCombinations_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Explanation of financial effect of adjustments related to business combinations</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ExplanationOfFinancialEffectOfAdjustmentsRelatedToBusinessCombinations_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Explanation of financial effect of adjustments related to business combinations</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_TaxRateEffectFromChangeInTaxRate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Tax rate effect from change in tax rate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_TaxRateEffectFromChangeInTaxRate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Tax effect on change in valuation allowance (Percentage)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ProvisionForOutstandingTaxDispute_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Provision for Outstanding Tax Dispute</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ProvisionForOutstandingTaxDispute_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Provision for outstanding tax dispute.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ProvisionForOutstandingTaxDispute_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Gross accrued provision for outstanding tax dispute</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfGeographicalAreasAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of geographical areas [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityFileNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity File Number</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_KeyManagementPersonnelOfEntityOrParentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Key Management Personnel of Entity or Parent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_KeyManagementPersonnelOfEntityOrParentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Key management personnel of entity or parent [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ReconciliationOfAccountingProfitMultipliedByApplicableTaxRatesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Reconciliation of accounting profit multiplied by applicable tax rates [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ProfitLossOfCombinedEntity_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Profit (loss) of combined entity as if combination occurred at beginning of period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ProfitLossOfCombinedEntity_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Consolidated net profit if acquisition occurred at beginning of period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_RelatedPartyTransactionsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Related party transactions [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_InitialPublicOfferingMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Initial Public Offering [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_InitialPublicOfferingMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Initial public offering.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_InitialPublicOfferingMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Initial Public Offering</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfPropertyPlantAndEquipmentAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of detailed information about property, plant and equipment [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CurrentTaxExpenseIncomeAndAdjustmentsForCurrentTaxOfPriorPeriodsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Current tax expense (income) and adjustments for current tax of prior periods [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CurrentTaxExpenseIncomeAndAdjustmentsForCurrentTaxOfPriorPeriodsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Current Tax Expense</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AdjustmentsForCurrentTaxOfPriorPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Adjustments for current tax of prior periods</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AdjustmentsForCurrentTaxOfPriorPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Under provision in respect of prior year</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityIncorporationDateOfIncorporation_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Incorporation, Date of Incorporation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityIncorporationDateOfIncorporation_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Date of incorporation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ChangesInOperatingAssetsAndLiabilitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Changes In Operating Assets And Liabilities [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ChangesInOperatingAssetsAndLiabilitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Changes in operating assets and liabilities.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ChangesInOperatingAssetsAndLiabilitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Changes in operating assets and liabilities:</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Adjustments for decrease (increase) in trade and other receivables</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Trade receivables due from related parties</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityShellCompany_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Shell Company</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ProductsTransferredAtAPointInTimeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Products Transferred at a Point In Time [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ProductsTransferredAtAPointInTimeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Products transferred at a point in time.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ProductsTransferredAtAPointInTimeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Products Transferred at a Point In Time</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfMaturityAnalysisForNonderivativeFinancialLiabilitiesTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of maturity analysis for non-derivative financial liabilities [table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_PostemploymentBenefitExpenseDefinedContributionPlans_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Post-employment benefit expense, defined contribution plans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_PostemploymentBenefitExpenseDefinedContributionPlans_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Contributions to defined contribution plans</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AdjustmentsForDecreaseIncreaseInContractAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Adjustments for decrease (increase) in contract assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AdjustmentsForDecreaseIncreaseInContractAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Contract assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="country_MY_lbl" xlink:role="http://www.xbrl.org/2003/role/label">MALAYSIA</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="country_MY_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Malaysia</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NoncurrentLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Non-current liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NoncurrentLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total Non-Current Liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NoncurrentLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Total Non-Current Liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityCurrentReportingStatus_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Current Reporting Status</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_EquityAndLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equity and liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_EquityAndLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total liabilities and equity</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IdentifiableIntangibleAssetsRecognisedAsOfAcquisitionDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Identifiable intangible assets recognised as of acquisition date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IdentifiableIntangibleAssetsRecognisedAsOfAcquisitionDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Intangible assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_FinancialLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financial liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_FinancialLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Financial liabilities at beginning of period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_FinancialLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Financial liabilities at end of period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_FinancialLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total contractual obligations</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfTradeAndOtherPayablesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of trade and other payables [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfTradeAndOtherPayablesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Trade and Other Payables</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_StatementOfFinancialPositionAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Statement of financial position [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ComputerEquipmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Computer equipment [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ComputerEquipmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Computer and Office Equipment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ReversalOfImpairmentLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Reversal of impairment loss</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ReversalOfImpairmentLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Reversal of impairment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ReversalOfImpairmentLoss_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Reversal of impairment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_LeaseLiabilitiesOriginalCurrency_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lease Liabilities, Original Currency</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_LeaseLiabilitiesOriginalCurrency_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Lease liabilities, original currency.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_LeaseLiabilitiesOriginalCurrency_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Lease liabilities, Original Currency</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ClosingForeignExchangeRateCalculatedUsingReportingCurrency_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Closing foreign exchange rate calculated using reporting currency</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ClosingForeignExchangeRateCalculatedUsingReportingCurrency_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Closing foreign exchange rate calculated using reporting currency.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_SegmentGeographicalDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Geographical [Domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentFiscalYearFocus_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Fiscal Year Focus</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_LaterThanThreeYearsAndNotLaterThanFourYearsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Later Than Three Years and Not Later Than Four Years</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_LaterThanThreeYearsAndNotLaterThanFourYearsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2028</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CashRepaymentsOfAdvancesAndLoansFromRelatedParties_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Repayment of loans from related parties</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CashRepaymentsOfAdvancesAndLoansFromRelatedParties_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash repayments of advances and loans from related parties</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ParValuePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Par value per share</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ParValuePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Par value of shares</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CashAndCashEquivalents_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash and cash equivalents</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CashAndCashEquivalents_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Cash and cash equivalents at beginning of period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CashAndCashEquivalents_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total cash and cash equivalents</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CashAndCashEquivalents_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash and cash equivalents</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CashAndCashEquivalents_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Cash deposits in bank accounts</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CashAndCashEquivalents_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Cash and cash equivalents at end of year/period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForDerecognitionOfFinancialInstrumentsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Description of accounting policy for derecognition of financial instruments [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForDerecognitionOfFinancialInstrumentsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Derecognition</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_FinancialAssetsRecognisedAsOfAcquisitionDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financial assets recognised as of acquisition date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_FinancialAssetsRecognisedAsOfAcquisitionDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Trade receivables</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_UsefulLifeMeasuredAsPeriodOfTimePropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Useful life measured as period of time, property, plant and equipment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_UsefulLifeMeasuredAsPeriodOfTimePropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Estimated useful life</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesPropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase (decrease) through net exchange differences, property, plant and equipment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesPropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Effect of movements in exchange rates</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Disaggregated Revenue</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of disaggregation of revenue from contracts with customers [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_CityAreaCode_lbl" xlink:role="http://www.xbrl.org/2003/role/label">City Area Code</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ComprehensiveIncomeAttributableToNoncontrollingInterests_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Comprehensive income, attributable to non-controlling interests</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ComprehensiveIncomeAttributableToNoncontrollingInterests_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total comprehensive income, attributable to non-controlling interests</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ComprehensiveIncomeAttributableToNoncontrollingInterests_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Non-controlling interests</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_KeyManagementPersonnelCompensation_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Key management personnel compensation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_KeyManagementPersonnelCompensation_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Key management personnel compensation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DilutiveEffectOfConvertibleInstrumentsOnNumberOfOrdinarySharesBasicAndDiluted_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Effect of conversion of convertible notes</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DilutiveEffectOfConvertibleInstrumentsOnNumberOfOrdinarySharesBasicAndDiluted_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Dilutive Effect Of Convertible Instruments On Number Of Ordinary Shares Basic And Diluted</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DilutiveEffectOfConvertibleInstrumentsOnNumberOfOrdinarySharesBasicAndDiluted_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Dilutive effect of convertible instruments on number of ordinary shares basic and diluted.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfForeignCurrencyExposureExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of foreign currency exposure explanatory</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfForeignCurrencyExposureExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Disclosure of foreign currency exposure explanatory.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfForeignCurrencyExposureExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Foreign Currency Exposure</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_LeaseLiabilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lease liability [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_LeaseLiabilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Lease liability.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_LeaseLiabilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Lease Liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_Liabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total Liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_Liabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_Liabilities_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_Liabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Liabilities at beginning of period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_Liabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Liabilities at end of period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_Liabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Total Liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_RestrictedCashAndCashEquivalents_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Restricted cash and cash equivalents</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_RestrictedCashAndCashEquivalents_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total restricted cash</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of reconciliation of liabilities arising from financing activities [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Reconciliation of Movements of Liabilities to Cash Flows Arising from Financing Activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfLeaseLiabilityInASaleAndLeasebackTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure Of Lease Liability in a Sale and Leaseback [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfLeaseLiabilityInASaleAndLeasebackTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Disclosure of lease liability in a sale and leaseback.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfLeaseLiabilityInASaleAndLeasebackTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Lease Liabilities in a Sale and Leaseback</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfSensitivityAnalysisForActuarialAssumptionsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of sensitivity analysis for actuarial assumptions [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ProceedsDueToARelatedParty_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Proceeds due to a related party</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ProceedsDueToARelatedParty_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Proceeds due to a related party.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ProfitLossFromOperatingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Profit (loss) from operating activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ProfitLossFromOperatingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Operating profit</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_LocalPhoneNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Local Phone Number</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CategoriesOfRelatedPartiesDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Categories of related parties [domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfReservesWithinEquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of reserves within equity [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesDeferredTaxLiabilityAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase (decrease) through net exchange differences, deferred tax liability (asset)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesDeferredTaxLiabilityAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Effect of movement in exchange rates</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_Right-Of-UseAssetMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Right-of-use asset [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_Right-Of-UseAssetMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Right-of-use asset.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_Right-Of-UseAssetMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Right-of-use assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfBusinessCombinationsTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of detailed information about business combination [table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AccumulatedOtherComprehensiveIncomeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accumulated other comprehensive income [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AccumulatedOtherComprehensiveIncomeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accumulated Other Comprehensive (Loss)/Income</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAccountReceivable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Adjustments for decrease (increase) in trade accounts receivable</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAccountReceivable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Trade receivables</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NameOfAcquiree_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Name of acquiree</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NameOfAcquiree_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Business combination, Name of acquiree</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DeferredTaxLiabilityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred tax liability [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DeferredTaxLiabilityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Deferred tax liability.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DeferredTaxLiabilityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Deferred tax liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_BusinessAcquisitionConsiderationPaidInCash_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business acquisition consideration paid in cash</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_BusinessAcquisitionConsiderationPaidInCash_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Business acquisition consideration paid in cash.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_BusinessAcquisitionConsiderationPaidInCash_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Business acquisition consideration paid</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CashTransferred_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash transferred</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CashTransferred_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash consideration</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfOtherComprehensiveIncomeByItemExplanatoryTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of other comprehensive income by item explanatory [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfOtherComprehensiveIncomeByItemExplanatoryTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Disclosure of other comprehensive income by item explanatory.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfOtherComprehensiveIncomeByItemExplanatoryTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Amounts Recognized in Profit or Loss</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ComprehensiveIncome_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Comprehensive income</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ComprehensiveIncome_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total comprehensive income</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ComprehensiveIncome_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Total comprehensive income</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OtherItemsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other Items</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OtherItemsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Items [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OtherItemsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Other items.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CashFlowsFromUsedInInvestingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash flows from (used in) investing activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CashFlowsFromUsedInInvestingActivities_lbl" xlink:role="http://www.xbrl.org/2009/role/netLabel">Net cash flows from (used in) investing activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CashFlowsFromUsedInInvestingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Net cash (used in)/provided by investing activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_RelatedPartyTransactionCashConsideration_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Related Party Transaction Cash Consideration</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_RelatedPartyTransactionCashConsideration_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Related party transaction cash consideration.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_RelatedPartyTransactionCashConsideration_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash consideration</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfExpensesChargedToStatementOfProfitOrLossExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of Expenses Charged to Statement of Profit or Loss Explanatory</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfExpensesChargedToStatementOfProfitOrLossExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Summary of expenses charged to statement of profit or loss.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfExpensesChargedToStatementOfProfitOrLossExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Expenses Charged to Statement of Profit or Loss</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForProvisionsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Description of accounting policy for provisions [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForProvisionsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Provisions</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ZakatLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Zakat Liability</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ZakatLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Zakat Liability.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ZakatLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Zakat liability</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfNatureAndFinancialEffectOfBusinessCombinationsDuringPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Description of nature and financial effect of business combinations during period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfNatureAndFinancialEffectOfBusinessCombinationsDuringPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Business combination, Description</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NumberOfSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Number of shares issued</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NumberOfSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total number of shares issued</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NumberOfSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Shares issued</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentInformationLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Information [Line Items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ReconciliationOfAccountingProfitMultipliedByApplicableTaxRatesLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Reconciliation of accounting profit multiplied by applicable tax rates [line items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ReconciliationOfAccountingProfitMultipliedByApplicableTaxRatesLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Reconciliation of accounting profit multiplied by applicable tax rates.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_NumberOfSharesIssuedNew_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Number Of Shares Issued New</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_NumberOfSharesIssuedNew_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Number of shares issued new.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_NumberOfSharesIssuedNew_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">New shares issued</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfExpensesByNatureExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of expenses by nature [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfExpensesByNatureExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Total Cost of Revenue Includes Expenses of Nature</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_AllowanceForReversalOfInventoriesObsolescence_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Allowance For Reversal Of Inventories Obsolescence</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_AllowanceForReversalOfInventoriesObsolescence_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Allowance for/(reversal of) inventories obsolescence.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_AllowanceForReversalOfInventoriesObsolescence_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Allowance for/(reversal of) inventories obsolescence</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_AllowanceForReversalOfInventoriesObsolescence_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Reversal of inventories obsolescence for 2025</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_RepaymentOfLoansDueToFormerRelatedParty_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Repayment of amount due to a former related party of the predecessor</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_RepaymentOfLoansDueToFormerRelatedParty_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Repayment of loans due to former related party</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_RepaymentOfLoansDueToFormerRelatedParty_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Repayment of loans due to former related party.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentTransitionReport_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Transition Report</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of non-adjusting events after reporting period [line items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_RangeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Range [axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfMaterialAccountingPolicyInformationExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of material accounting policy information [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfMaterialAccountingPolicyInformationExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Material Accounting Policies</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfContingentLiabilitiesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Contingencies</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfContingentLiabilitiesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of contingent liabilities [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_IncreaseDecreaseInterestRateRiskBasisPoint_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase decrease Interest rate risk basis point</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_IncreaseDecreaseInterestRateRiskBasisPoint_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Increase decrease Interest rate risk basis point.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_AllotmentOfOrdinaryShares_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Allotment of Ordinary Shares</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_AllotmentOfOrdinaryShares_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Allotment of ordinary shares.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_AllotmentOfOrdinaryShares_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Allotment of ordinary shares</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_LeaseTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lease [table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_LeaseTable_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Lease.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of temporary difference, unused tax losses and unused tax credits [table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfOperatingLeaseLiabilitiesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Lease liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfOperatingLeaseLiabilitiesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of operating lease liabilities explanatory</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfOperatingLeaseLiabilitiesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Disclosure of operating lease liabilities explanatory.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfAllowanceForCreditLossesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Summary of Allowance for Impairment in Respect of Trade Receivables and Contract Assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfAllowanceForCreditLossesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of allowance for credit losses [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ForeignCurrencyExposureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Foreign Currency Exposure [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ForeignCurrencyExposureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Foreign currency exposure.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DeferredOfferingCostsNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Deferred offering costs</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DeferredOfferingCostsNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred offering costs noncurrent</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DeferredOfferingCostsNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Deferred offering costs noncurrent.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_RelatedPartiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Total for all related parties [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_RelatedPartiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Related Parties</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NetDeferredTaxAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Net deferred tax assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NetDeferredTaxAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Deferred tax assets, net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_NetDeferredTaxAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Deferred tax assets, net of valuation allowance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfOtherIncomeExpensesNetExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Other Income (Expenses), Net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfOtherIncomeExpensesNetExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of Other Income Expenses Net Explanatory</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfOtherIncomeExpensesNetExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Disclosure of other income expenses net.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_WeightedAverageDurationOfDefinedBenefitObligation2019_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Weighted average duration of defined benefit obligation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_WeightedAverageDurationOfDefinedBenefitObligation2019_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Weighted average duration of defined benefit obligation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_USDTenPercentWeakeningMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">USD (10% Weakening)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_USDTenPercentWeakeningMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">USD ten percent weakening [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_USDTenPercentWeakeningMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">USD ten percent weakening.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfChangesInAccountingEstimatesLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of changes in accounting estimates [line items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_AuditorFirmId_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Auditor Firm ID</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_InventoryMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Inventory [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_InventoryMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Inventory.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_InventoryMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Inventories</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_AllowanceForReversalOfExpectedCreditLosses_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Allowance for (reversal of) expected credit losses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_AllowanceForReversalOfExpectedCreditLosses_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Allowance for (reversal of) expected credit losses.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_AllowanceForReversalOfExpectedCreditLosses_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Allowance for/(reversal of) expected credit losses</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_EquityInterestHoldDescription_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Equity interest hold description</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_EquityInterestHoldDescription_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equity interest hold description</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_EquityInterestHoldDescription_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Equity interest hold description.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AdjustmentsForDeferredTaxOfPriorPeriods_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Adjustments for deferred tax of prior periods</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AdjustmentsForDeferredTaxOfPriorPeriods_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Over provision in respect of prior year</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Additions other than through business combinations, property, plant and equipment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Additions</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Other comprehensive income, net of tax, exchange differences on translation of foreign operations</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other comprehensive income, net of tax, exchange differences on translation of foreign operations</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Foreign currency translation adjustments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Foreign currency translation adjustments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfSummarisedFinancialInformationAboutForeignOperationExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Foreign Currency Translation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfSummarisedFinancialInformationAboutForeignOperationExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of summarised financial information about foreign operation [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityWellKnownSeasonedIssuer_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Well-known Seasoned Issuer</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OtherAssetsRecognisedAsOfAcquisitionDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Assets Recognised As Of Acquisition Date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OtherAssetsRecognisedAsOfAcquisitionDate_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Other assets recognised as of acquisition date.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OtherAssetsRecognisedAsOfAcquisitionDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_SensitivityOfForeignCurrency_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Sensitivity of foreign currency</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_SensitivityOfForeignCurrency_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Sensitivity Of Foreign Currency</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_SensitivityOfForeignCurrency_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Sensitivity Of Foreign Currency</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_SumitomoCorporationMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Sumitomo Corporation [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_SumitomoCorporationMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Sumitomo Corporation member.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_SumitomoCorporationMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Sumitomo Corporation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfBusinessCombinationsLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of detailed information about business combination [line items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CashAndCashEquivalentsRecognisedAsOfAcquisitionDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash and cash equivalents recognised as of acquisition date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CashAndCashEquivalentsRecognisedAsOfAcquisitionDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Cash and cash equivalents</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_InvestmentAccountedForUsingEquityMethod_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Opening Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_InvestmentAccountedForUsingEquityMethod_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Investments accounted for using equity method</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_InvestmentAccountedForUsingEquityMethod_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total investments accounted for using equity method</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_InvestmentAccountedForUsingEquityMethod_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Opening balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_InvestmentAccountedForUsingEquityMethod_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Ending Balance</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_RestrictedCashAndCashEquivalentAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Restricted Cash And Cash Equivalent [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_RestrictedCashAndCashEquivalentAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Restricted Cash And Cash Equivalent.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForIntangibleAssetsOtherThanGoodwillExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Description of accounting policy for intangible assets other than goodwill [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForIntangibleAssetsOtherThanGoodwillExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Intangible assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CurrentContractAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Contract assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CurrentContractAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Current contract assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CurrentContractAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Balance at end of period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CurrentContractAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Balance at beginning of period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_OtherGainsLosses_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other gains (losses)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_OtherGainsLosses_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Total other income/(expenses), net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_OtherGainsLosses_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total other income/(expenses), net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_OtherGainsLosses_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Gain on bargain purchase</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfNetDefinedBenefitLiabilityAssetLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of net defined benefit liability (asset) [line items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CategoriesOfFinancialAssetsDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Categories of financial assets [domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForTransactionsWithRelatedPartiesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Description of accounting policy for transactions with related parties [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForTransactionsWithRelatedPartiesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Related parties</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfIntangibleAssetsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of intangible assets [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfIntangibleAssetsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Intangible Assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForFinancialLiabilitiesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Description of accounting policy for financial liabilities [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfAccountingPolicyForFinancialLiabilitiesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fiancial liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ProfitLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net profit</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ProfitLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Net profit</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ProfitLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Profit for the period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ProfitLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Segment Profit (Loss)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ProfitLoss_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Net profit</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ProfitLoss_lbl" xlink:role="http://www.xbrl.org/2009/role/netLabel">Net income</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ClassesOfAssetsDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Classes of assets [domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IncreaseDecreaseThroughFinancingCashFlowsLiabilitiesArisingFromFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase (decrease) through financing cash flows, liabilities arising from financing activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IncreaseDecreaseThroughFinancingCashFlowsLiabilitiesArisingFromFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total changes from financing cash flows</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfSensitivityAnalysisForActuarialAssumptionsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of sensitivity analysis for actuarial assumptions [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfSensitivityAnalysisForActuarialAssumptionsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Sensitivity Analysis for Significant Actuarial Assumptions</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_GeographicalAreasAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Geographical areas [axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ConcentrationOfCreditRiskPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Percentage of trade receivables</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ConcentrationOfCreditRiskPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Concentration of credit risk percentage</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ConcentrationOfCreditRiskPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Concentration of credit risk percentage.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_LiabilitiesArisingFromFinancingActivitiesAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Liabilities arising from financing activities [axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityCommonStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Common Stock, Shares Outstanding</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_PastDueStatusAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Past due status [axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_NumberOfOrdinarySharesConvertedFromBond_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of ordinary shares converted from bond</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_NumberOfOrdinarySharesConvertedFromBond_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Number Of Ordinary Shares Converted From Bond</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_NumberOfOrdinarySharesConvertedFromBond_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Number of ordinary shares converted from bond.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ClosingForeignExchangeRate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Closing foreign exchange rate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_FinancialLiabilitiesAtAmortisedCostCategoryMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financial liabilities at amortised cost, category [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_FinancialLiabilitiesAtAmortisedCostCategoryMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Financial Liabilities at Amortized Cost</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CurrentTaxLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Current tax liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CurrentTaxLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Tax payable</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_USDTenPercentStrengtheningMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">USD (10% Strengthening)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_USDTenPercentStrengtheningMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">USD Ten Percent Strengthening [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_USDTenPercentStrengtheningMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">USD ten percent strengthening.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CurrentPrepaymentsAndCurrentAccruedIncomeOtherThanCurrentContractAssetsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Current prepayments and current accrued income other than current contract assets [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IncomeTaxesPaidRefundClassifiedAsOperatingActivities_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Income taxes paid</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IncomeTaxesPaidRefundClassifiedAsOperatingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Income taxes paid (refund), classified as operating activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IncomeTaxesPaidRefundClassifiedAsOperatingActivities_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel">Income taxes refund (paid)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_IncomeTaxesPaidRefundClassifiedAsOperatingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Payment of tax payable</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_BorrowingsMaturity_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Borrowings, maturity</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_BorrowingsMaturity_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Year of Maturity</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_WeightedAverageOrdinarySharesUsedInCalculatingBasicAndDilutedEarningsPerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Weighted-average number of ordinary shares at the end of year/period</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_WeightedAverageOrdinarySharesUsedInCalculatingBasicAndDilutedEarningsPerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Weighted Average Ordinary Shares Used in Calculating Basic and Diluted Earnings Per Share</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_WeightedAverageOrdinarySharesUsedInCalculatingBasicAndDilutedEarningsPerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Weighted average ordinary shares used in calculating basic and diluted earnings per share.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_PercentageOfWarrantsIssuedToTotalOrdinarySharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Percentage of Warrants Issued to Total Ordinary Shares Issued</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_PercentageOfWarrantsIssuedToTotalOrdinarySharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Percentage of warrants issued to total ordinary shares issued.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_PercentageOfWarrantsIssuedToTotalOrdinarySharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Percentage of warrants issued to total ordinary shares issued</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_MaturityAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Maturity [axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_OtherTaxEffectsForReconciliationBetweenAccountingProfitAndTaxExpenseIncome_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other tax effects for reconciliation between accounting profit and tax expense (income)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_OtherTaxEffectsForReconciliationBetweenAccountingProfitAndTaxExpenseIncome_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Others</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_InterestExpenseIncomeNetDefinedBenefitLiabilityAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Interest cost</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_InterestExpenseIncomeNetDefinedBenefitLiabilityAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase (decrease) in net defined benefit liability (asset) resulting from interest expense (income)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DecreaseInDefinedBenefitObligationDueToDecreaseInActuarialAssumptionOfFutureSalaryGrowth_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Decrease In Defined Benefit Obligation Due To DecreaseIn Actuarial Assumption Of Future Salary Growth</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DecreaseInDefinedBenefitObligationDueToDecreaseInActuarialAssumptionOfFutureSalaryGrowth_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Decrease in defined benefit obligation due to decrease in actuarial assumption of future salary growth.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DecreaseInDefinedBenefitObligationDueToDecreaseInActuarialAssumptionOfFutureSalaryGrowth_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Salary growth rate 1% decrease</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_RightOfUseAssetsRecognisedAsOfAcquisitionDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Right Of Use Assets Recognised As Of Acquisition Date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_RightOfUseAssetsRecognisedAsOfAcquisitionDate_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Right of use assets recognised as of acquisition date.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_RightOfUseAssetsRecognisedAsOfAcquisitionDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Right-of-use assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfFinanceCostByRelatedPartiesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure Of Finance Cost By Related Parties Explanatory</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfFinanceCostByRelatedPartiesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Disclosure of finance cost by related parties explanatory.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfFinanceCostByRelatedPartiesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Finance Cost</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CurrencyRiskMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Currency risk [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CurrencyRiskMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Currency Risk</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfEmployeeBenefitsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of employee benefits [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfEmployeeBenefitsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Employee Benefits Obligation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ImpairmentOfCWIPMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Impairment of CWIP [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ImpairmentOfCWIPMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Impairment of CWIP.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ImpairmentOfCWIPMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Impairment of CWIP</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of disaggregation of revenue from contracts with customers [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_SCTubularSolutionsMalaysiaSdnBhdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">SC Tubular Solutions Malaysia Sdn. Bhd. [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_SCTubularSolutionsMalaysiaSdnBhdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">SC Tubular Solutions Malaysia Sdn. Bhd. member.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_SCTubularSolutionsMalaysiaSdnBhdMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">SC Tubular Solutions Malaysia Sdn. Bhd.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_MaturityDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Maturity [domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_MaturityAnalysisForNonderivativeFinancialLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Summary of Contractual Maturities of Financial Liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_MaturityAnalysisForNonderivativeFinancialLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of maturity analysis for non-derivative financial liabilities [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfQuantitativeInformationAboutRightofuseAssetsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of quantitative information about right-of-use assets [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfQuantitativeInformationAboutRightofuseAssetsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Right-of-use Assets</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfReservesWithinEquityLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of reserves within equity [line items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_LaterThanTwoMonthsAndNotLaterThanThreeMonthsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Later than two months and not later than three months [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_LaterThanTwoMonthsAndNotLaterThanThreeMonthsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">61 - 90 Days Past Due</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DilutiveEffectOfConvertibleInstrumentsOnNumberOfOrdinaryShares_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Dilutive effect of convertible instruments on weighted average number of ordinary shares</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DilutiveEffectOfConvertibleInstrumentsOnNumberOfOrdinaryShares_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Effect of conversion of convertible notes</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfCategoriesOfFinancialInstrumentsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of categories of financial instruments explanatory</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfCategoriesOfFinancialInstrumentsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Disclosure of categories of financial instruments.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfCategoriesOfFinancialInstrumentsExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Summary of Categories of Financial Instruments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_EarningsPerShareAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Earnings per share [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_FixedAssetsDepreciationMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fixed assets depreciation [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_FixedAssetsDepreciationMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Fixed assets depreciation.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_FixedAssetsDepreciationMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fixed assets depreciation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_ClassesOfAssetsAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Classes of assets [axis]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfNatureOfEntitysOperationsAndPrincipalActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Description of nature of entity's operations and principal activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DescriptionOfNatureOfEntitysOperationsAndPrincipalActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Principal activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CashFlowsFromUsedInFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash flows from (used in) financing activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CashFlowsFromUsedInFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2009/role/netLabel">Net cash flows from (used in) financing activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_CashFlowsFromUsedInFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Net cash (used in)/provided by financing activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DeferredTaxAssetsNotRecognizedExplanatoryTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred tax assets not recognized explanatory [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DeferredTaxAssetsNotRecognizedExplanatoryTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Deferred tax assets not recognized explanatory.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DeferredTaxAssetsNotRecognizedExplanatoryTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Deferred Tax Assets Not Recognized</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfFinanceIncomeProvidedByRelatedPartiesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure Of Finance Income Provided By Related Parties Explanatory</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfFinanceIncomeProvidedByRelatedPartiesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Disclosure of finance income provided by related parties explanatory.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfFinanceIncomeProvidedByRelatedPartiesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Finance Income</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfBasisOfConsolidationExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of basis of consolidation [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfBasisOfConsolidationExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Basis of consolidation</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskManagementThirdPartyEngagedFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Management Third Party Engaged [Flag]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ScheduleOfInventoriesTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Inventories</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ScheduleOfInventoriesTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of inventories [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ScheduleOfInventoriesTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Schedule of inventories.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognised_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deductible temporary differences for which no deferred tax asset is recognised</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognised_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Deductible temporary differences</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DeferredTaxAssetAllowances_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred tax asset allowances</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DeferredTaxAssetAllowances_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Deferred tax asset allowances.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DeferredTaxAssetAllowances_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Deferred tax asset allowances</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OtherLiabilitiesRecognisedAsOfAcquisitionDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Liabilities Recognised As Of Acquisition Date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OtherLiabilitiesRecognisedAsOfAcquisitionDate_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Other liabilities recognised as of acquisition date.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OtherLiabilitiesRecognisedAsOfAcquisitionDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OtherLiabilitiesRecognisedAsOfAcquisitionDate_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Other liabilities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_RepaymentOfAmountDueToFormerRelatedPartyAndLoansAndBorrowings_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Repayment of Amount Due to Former Related Party and Loans and Borrowings</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_RepaymentOfAmountDueToFormerRelatedPartyAndLoansAndBorrowings_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Repayment of amount due to former related party and loans and borrowings</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_RepaymentOfAmountDueToFormerRelatedPartyAndLoansAndBorrowings_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Repayment of loans and borrowings</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_RepaymentOfAmountDueToFormerRelatedPartyAndLoansAndBorrowings_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Repayment of amount due to a former related party of the predecessor</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_TradeAndOtherPayablesUndiscountedCashFlows_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Trade and other payables, undiscounted cash flows</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_TradeAndOtherPayablesUndiscountedCashFlows_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Trade and other payables</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_TradeReceivables_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Trade receivables</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of transactions between related parties [table]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_PropertyPlantAndEquipmentRecognisedAsOfAcquisitionDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Property, plant and equipment recognised as of acquisition date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_PropertyPlantAndEquipmentRecognisedAsOfAcquisitionDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Property, plant and equipment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ChangeInDefinedBenefitObligationDueToReasonablyPossibleIncreaseInActuarialAssumptionOnFutureSalaryGrowth_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Change In Defined Benefit Obligation Due To Reasonably Possible Increase In Actuarial Assumption On Future Salary Growth</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ChangeInDefinedBenefitObligationDueToReasonablyPossibleIncreaseInActuarialAssumptionOnFutureSalaryGrowth_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Change in defined benefit obligation due to reasonably possible increase in actuarial assumption on future salary growth.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ChangeInDefinedBenefitObligationDueToReasonablyPossibleIncreaseInActuarialAssumptionOnFutureSalaryGrowth_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Salary growth rate 1% increase</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_AttributionOfExpensesByNatureToTheirFunctionDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Attribution of expenses by nature to their function [domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_RangeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Range [domain]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="cyd_CybersecurityRiskManagementProcessesForAssessingIdentifyingAndManagingThreatsTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfEarningsPerShareExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Earnings Per Share</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfEarningsPerShareExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of earnings per share [text block]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_GoodsAndServicesTaxReceivableNet_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Goods and services tax receivable, net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_GoodsAndServicesTaxReceivableNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Goods And Services Tax Receivable Net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_GoodsAndServicesTaxReceivableNet_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Goods and services tax receivable net.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DisclosureOfBusinessCombinationsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of detailed information about business combination [abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="country_TH_lbl" xlink:role="http://www.xbrl.org/2003/role/label">THAILAND</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="country_TH_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Thailand</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ChangeInDefinedBenefitObligationDueToReasonablyPossibleDecreaseInActuarialAssumptionOnDiscountRate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Change In Defined Benefit Obligation Due To Reasonably Possible Decrease In Actuarial Assumption On Discount Rate</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ChangeInDefinedBenefitObligationDueToReasonablyPossibleDecreaseInActuarialAssumptionOnDiscountRate_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Change in defined benefit obligation due to reasonably possible decrease in actuarial assumption on discount rate.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ChangeInDefinedBenefitObligationDueToReasonablyPossibleDecreaseInActuarialAssumptionOnDiscountRate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Discount rate (per annum) 1% decrease</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_LaterThanFiveYearsAndNotLaterThanSixYearsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Later than five years and not later than six years [member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_LaterThanFiveYearsAndNotLaterThanSixYearsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Later than five years and not later than six years.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_LaterThanFiveYearsAndNotLaterThanSixYearsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Later Than Five Years and Not Later Than Six Years</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_LaterThanFiveYearsAndNotLaterThanSixYearsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">2030</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_Revenue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Revenue</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_Revenue_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total revenue</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_Revenue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Total revenue</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_Revenue_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Segment Revenue, net</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_LeaseLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lease [lineItems]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_LeaseLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Lease.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_LeaseLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Leases [line items]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DividendsReceivedFromAssociatesClassifiedAsInvestingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Dividends received from associates, classified as investing activities</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DividendsReceivedFromAssociatesClassifiedAsInvestingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Dividend received from associates during the year</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_DividendsReceivedFromAssociatesClassifiedAsInvestingActivities_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Dividends received from associates during the year</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_RevenueOfAcquiree_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Revenue of acquiree since acquisition date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_RevenueOfAcquiree_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Revenue since acquisition date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfGoodsOrServicesProvidedByRelatedPartiesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Goods or Services Provided by Related Parties</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfGoodsOrServicesProvidedByRelatedPartiesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Disclosure of Goods or Services Provided by Related Parties Explanatory</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_DisclosureOfGoodsOrServicesProvidedByRelatedPartiesExplanatory_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Disclosure of goods or services provided by related parties explanatory.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OMSPLMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">OMS PL</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OMSPLMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">OMSPL [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_OMSPLMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">OMSPL.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ContributionsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Contributions [Abstract]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ContributionsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Contributions.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_ContributionsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Contributions</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_PropertyPlantAndEquipmentsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Property, plant and equipment</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_PropertyPlantAndEquipmentsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Property, Plant and Equipments [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_PropertyPlantAndEquipmentsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Property, plant and equipments.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_AmountDueToRelatedPartiesRecognizedAsOFAcquisitionDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Amount Due To Related Parties Recognized As OF Acquisition Date</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_AmountDueToRelatedPartiesRecognizedAsOFAcquisitionDate_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Amount due to related parties recognized as of acquisition date.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_AmountDueToRelatedPartiesRecognizedAsOFAcquisitionDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Amount due to related parties</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_AmountDueToRelatedPartiesRecognizedAsOFAcquisitionDate_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Amount due to related parties</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_RenderingOfPremiumThreadingAndOtherAncillaryServicesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Rendering of Premium Threading and Other Ancillary Services [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_RenderingOfPremiumThreadingAndOtherAncillaryServicesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Rendering of premium threading and other ancillary services.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_RenderingOfPremiumThreadingAndOtherAncillaryServicesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Rendering of Premium Threading and Other Ancillary Services</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_OtherTaxRateEffectsForReconciliationBetweenAccountingProfitAndTaxExpenseIncome_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other tax rate effects for reconciliation between accounting profit and tax expense (income)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="ifrs-full_OtherTaxRateEffectsForReconciliationBetweenAccountingProfitAndTaxExpenseIncome_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Others (Percentage)</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_WeightedAverageSharesBasicAndDilutedWithDilutiveEffectOfAllInstruments_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Weighted Average Shares Basic And Diluted With Dilutive Effect Of All Instruments</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_WeightedAverageSharesBasicAndDilutedWithDilutiveEffectOfAllInstruments_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Weighted average shares basic and diluted with dilutive effect of all instruments.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="omse_WeightedAverageSharesBasicAndDilutedWithDilutiveEffectOfAllInstruments_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Weighted-average number of ordinary shares at the end of year/period</link:label>
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          <link:calculationArc xlink:type="arc" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="ifrs-full_FinancialLiabilities" xlink:to="ifrs-full_TradeAndOtherPayablesUndiscountedCashFlows" order="0" weight="1" use="optional"/>
          <link:calculationArc xlink:type="arc" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="ifrs-full_FinancialLiabilities" xlink:to="ifrs-full_BankBorrowingsUndiscountedCashFlows" order="1" weight="1" use="optional"/>
          <link:calculationArc xlink:type="arc" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="ifrs-full_FinancialLiabilities" xlink:to="ifrs-full_GrossLeaseLiabilities" order="2" weight="1" use="optional"/>
          <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_FinancialLiabilities" xlink:label="ifrs-full_FinancialLiabilities"/>
          <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_TradeAndOtherPayablesUndiscountedCashFlows" xlink:label="ifrs-full_TradeAndOtherPayablesUndiscountedCashFlows"/>
          <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_BankBorrowingsUndiscountedCashFlows" xlink:label="ifrs-full_BankBorrowingsUndiscountedCashFlows"/>
          <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_GrossLeaseLiabilities" xlink:label="ifrs-full_GrossLeaseLiabilities"/>
        </link:calculationLink>
        <link:calculationLink xlink:type="extended" xlink:role="http://www.omsos.com/20250331/taxonomy/role/DisclosureFinancialInstrumentsSummaryOfForeignCurrencyExposureDetails">
          <link:calculationArc xlink:type="arc" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="omse_ForeignCurrencyExposure" xlink:to="ifrs-full_TradeReceivables" order="0" weight="1" use="optional"/>
          <link:calculationArc xlink:type="arc" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="omse_ForeignCurrencyExposure" xlink:to="ifrs-full_CashAndCashEquivalents" order="1" weight="1" use="optional"/>
          <link:calculationArc xlink:type="arc" xlink:arcrole="https://xbrl.org/2023/arcrole/summation-item" xlink:from="omse_ForeignCurrencyExposure" xlink:to="ifrs-full_TradeAndOtherPayablesToTradeSuppliers" order="2" weight="-1" use="optional"/>
          <link:loc xlink:type="locator" xlink:href="omse-20250331.xsd#omse_ForeignCurrencyExposure" xlink:label="omse_ForeignCurrencyExposure"/>
          <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_TradeReceivables" xlink:label="ifrs-full_TradeReceivables"/>
          <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_CashAndCashEquivalents" xlink:label="ifrs-full_CashAndCashEquivalents"/>
          <link:loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_TradeAndOtherPayablesToTradeSuppliers" xlink:label="ifrs-full_TradeAndOtherPayablesToTradeSuppliers"/>
        </link:calculationLink>
      </link:linkbase>
    </xsd:appinfo>
  </xsd:annotation>
  <xsd:element id="omse_DeferredTaxAssetsNotRecognizedAmount" name="DeferredTaxAssetsNotRecognizedAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="omse_TaxEffectOnChangeInValuationAllowance" name="TaxEffectOnChangeInValuationAllowance" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="omse_EmployeeBenefitsMember" name="EmployeeBenefitsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_RightOfUseAssetsEffectOfMovementsInExchangeRates" name="RightOfUseAssetsEffectOfMovementsInExchangeRates" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="omse_InterestChargedOutstandingBalances" name="InterestChargedOutstandingBalances" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="omse_IncomeStatementTable" name="IncomeStatementTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_TradeAndOtherPayablesTable" name="TradeAndOtherPayablesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_DisclosureOfSignificantActuarialAssumptionsUsedInActuarialCalculationsExplanatory" name="DisclosureOfSignificantActuarialAssumptionsUsedInActuarialCalculationsExplanatory" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_LaterThanFiveYearsAndNotLaterThanSixYearsMember" name="LaterThanFiveYearsAndNotLaterThanSixYearsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_OtherIncomeExpensesNet" name="OtherIncomeExpensesNet" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="omse_ChangesInOperatingAssetsAndLiabilities" name="ChangesInOperatingAssetsAndLiabilities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="omse_DeferredTaxLiabilityIncludingPPAAdjustment" name="DeferredTaxLiabilityIncludingPPAAdjustment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="omse_OrganizationAndPrincipalActivitiesTable" name="OrganizationAndPrincipalActivitiesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_GoodsAndServicesTaxReceivableNet" name="GoodsAndServicesTaxReceivableNet" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="omse_Right-Of-UseAssetMember" name="Right-Of-UseAssetMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_BruneiDollarMember" name="BruneiDollarMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_ReconciliationOfAccountingProfitMultipliedByApplicableTaxRatesTable" name="ReconciliationOfAccountingProfitMultipliedByApplicableTaxRatesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_LeaseLiabilityMember" name="LeaseLiabilityMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_DisclosureOfPropertyPlantAndEquipmentExplanatoryTableTextBlock" name="DisclosureOfPropertyPlantAndEquipmentExplanatoryTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_OMSOilfieldServicesPteLtdMember" name="OMSOilfieldServicesPteLtdMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_InterestExpensesFromEmployeesDefinedBenefitsObligation" name="InterestExpensesFromEmployeesDefinedBenefitsObligation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="omse_CategoriesOfFinancialAssetsAndLiabilitiesTable" name="CategoriesOfFinancialAssetsAndLiabilitiesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_AllowanceForCreditLossesAmountsWrittenOff" name="AllowanceForCreditLossesAmountsWrittenOff" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="omse_ProductsTransferredAtAPointInTimeMember" name="ProductsTransferredAtAPointInTimeMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_SCTubularSolutionsBSdnBhdMember" name="SCTubularSolutionsBSdnBhdMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_ContributionsAbstract" name="ContributionsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_OMSOilfieldServicesAustraliaPtyLtdMember" name="OMSOilfieldServicesAustraliaPtyLtdMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_DisclosureOfLeaseLiabilityInASaleAndLeasebackTextBlock" name="DisclosureOfLeaseLiabilityInASaleAndLeasebackTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_CustomerOneMember" name="CustomerOneMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_ThirdPartiesMember" name="ThirdPartiesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_PropertyPlantAndEquipmentsMember" name="PropertyPlantAndEquipmentsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_FinanceCostsDisclosureAbstract" name="FinanceCostsDisclosureAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_IncreaseDecreaseThroughChangesInInterestExpenseRelatedToLiabilitiesArisingFromFinancingActivities" name="IncreaseDecreaseThroughChangesInInterestExpenseRelatedToLiabilitiesArisingFromFinancingActivities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="omse_UnrecognisedDeferredTaxAssetsDescription" name="UnrecognisedDeferredTaxAssetsDescription" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_ReconciliationOfAccountingProfitMultipliedByApplicableTaxRatesLineItems" name="ReconciliationOfAccountingProfitMultipliedByApplicableTaxRatesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_AditionalPaymentOnEquityMethodInvestmentsRecognizedAsCapitalInjection" name="AditionalPaymentOnEquityMethodInvestmentsRecognizedAsCapitalInjection" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="omse_RevaluationOfAssetsInConnectionToMBOMember" name="RevaluationOfAssetsInConnectionToMBOMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_AllowanceForExpectedCreditLosses" name="AllowanceForExpectedCreditLosses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="omse_MovementInDeferredTaxLiabilitiesMember" name="MovementInDeferredTaxLiabilitiesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_OtherAncillaryServicesMember" name="OtherAncillaryServicesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_CurrentTradeReceivablesIncludingAllowanceForExpectedCreditLosses" name="CurrentTradeReceivablesIncludingAllowanceForExpectedCreditLosses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="omse_ForeignCurrencyExposureTable" name="ForeignCurrencyExposureTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_CategoriesOfFinancialAssetsAndLiabilitiesLineItems" name="CategoriesOfFinancialAssetsAndLiabilitiesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_NumberOfOrdinarySharesConvertedFromBond" name="NumberOfOrdinarySharesConvertedFromBond" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="omse_SaleOfOilfieldEquipmentProductsMember" name="SaleOfOilfieldEquipmentProductsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_WeightedAverageOrdinarySharesIssuedBasicAndDiluted" name="WeightedAverageOrdinarySharesIssuedBasicAndDiluted" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_ClassBOrdinarySharesMember" name="ClassBOrdinarySharesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_ConversionOfConvertibleBondToShares" name="ConversionOfConvertibleBondToShares" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="omse_DeferredTaxAssetsNotRecognizedPercent" name="DeferredTaxAssetsNotRecognizedPercent" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_CashDepositInsured" name="CashDepositInsured" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="omse_InventoryMember" name="InventoryMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_ChangeInDefinedBenefitObligationDueToReasonablyPossibleDecreaseInActuarialAssumptionOnFutureSalaryGrowth" name="ChangeInDefinedBenefitObligationDueToReasonablyPossibleDecreaseInActuarialAssumptionOnFutureSalaryGrowth" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_DilutiveEffectOfIssuableSharesOnWeightedAverageNumberOfOrdinaryShares" name="DilutiveEffectOfIssuableSharesOnWeightedAverageNumberOfOrdinaryShares" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="omse_SuppliesAndSubcontractingCosts" name="SuppliesAndSubcontractingCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="omse_IndonesianRupiahMember" name="IndonesianRupiahMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_ChangeInDefinedBenefitObligationDueToReasonablyPossibleIncreaseInActuarialAssumptionOnFutureSalaryGrowth" name="ChangeInDefinedBenefitObligationDueToReasonablyPossibleIncreaseInActuarialAssumptionOnFutureSalaryGrowth" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_OtherChangesLiability-RelatedAbstract" name="OtherChangesLiability-RelatedAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_BusinessAcquisitionConsiderationPaidInCash" name="BusinessAcquisitionConsiderationPaidInCash" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="omse_RenderingOfPremiumThreadingAndOtherAncillaryServicesMember" name="RenderingOfPremiumThreadingAndOtherAncillaryServicesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_DisclosureOfFinanceCostByRelatedPartiesExplanatory" name="DisclosureOfFinanceCostByRelatedPartiesExplanatory" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_GoodsAndServicesTaxPayableNet" name="GoodsAndServicesTaxPayableNet" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="omse_ChiefExecutiveOfficerOfOMSMember" name="ChiefExecutiveOfficerOfOMSMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_TransactionsWithOwnersOfTheCompanyShares" name="TransactionsWithOwnersOfTheCompanyShares" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_ClassAOrdinarySharesMember" name="ClassAOrdinarySharesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_TaxPaidAriseFromTaxAssessment" name="TaxPaidAriseFromTaxAssessment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="omse_WeightedAverageOrdinarySharesUsedInCalculatingBasicAndDilutedEarningsPerShare" name="WeightedAverageOrdinarySharesUsedInCalculatingBasicAndDilutedEarningsPerShare" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="omse_PercentageOfExercisePriceOfWarrantToPriceOfOrdinarySharesOffered" name="PercentageOfExercisePriceOfWarrantToPriceOfOrdinarySharesOffered" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="omse_AdditionalCashPaymentToAssociates" name="AdditionalCashPaymentToAssociates" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="omse_OtherMinorityMember" name="OtherMinorityMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_ProportionOfOwnershipInterestByCEO" name="ProportionOfOwnershipInterestByCEO" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_ZakatLiability" name="ZakatLiability" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="omse_TaxAdjustmentOfPreviousYearsPercent" name="TaxAdjustmentOfPreviousYearsPercent" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_ProceedsDueToARelatedParty" name="ProceedsDueToARelatedParty" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="omse_RelatedPartyTransactionCashConsideration" name="RelatedPartyTransactionCashConsideration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="omse_LoansAndBorrowingsArisingFromFinancingActivitiesBeginningBalance" name="LoansAndBorrowingsArisingFromFinancingActivitiesBeginningBalance" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="omse_TaxAdjustmentOfPreviousYearsAmount" name="TaxAdjustmentOfPreviousYearsAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="omse_AllowanceForInventoriesObsolescence" name="AllowanceForInventoriesObsolescence" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="omse_AmountDueToRelatedPartiesRecognizedAsOFAcquisitionDate" name="AmountDueToRelatedPartiesRecognizedAsOFAcquisitionDate" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="omse_PlantAndMachineryMember" name="PlantAndMachineryMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_DisclosureOfExpensesChargedToStatementOfProfitOrLossExplanatory" name="DisclosureOfExpensesChargedToStatementOfProfitOrLossExplanatory" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_AllowanceForReversalOfExpectedCreditLosses" name="AllowanceForReversalOfExpectedCreditLosses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="omse_ExistingShareholdersMember" name="ExistingShareholdersMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_CarryingValueOfEquityMethodInvestments" name="CarryingValueOfEquityMethodInvestments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="omse_OMSOilfieldHoldingsSdnBhdMember" name="OMSOilfieldHoldingsSdnBhdMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_DilutiveEffectOfConvertibleInstrumentsOnNumberOfOrdinarySharesBasicAndDiluted" name="DilutiveEffectOfConvertibleInstrumentsOnNumberOfOrdinarySharesBasicAndDiluted" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_MovementInDeferredTaxBalancesTable" name="MovementInDeferredTaxBalancesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_DisclosureOfCashAndCashEquivalentsDescriptionExplanatory" name="DisclosureOfCashAndCashEquivalentsDescriptionExplanatory" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_OrganizationAndPrincipalActivitiesLineItems" name="OrganizationAndPrincipalActivitiesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_MalaysianRinggitMember" name="MalaysianRinggitMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_SensitivityOfForeignCurrency" name="SensitivityOfForeignCurrency" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="omse_DisclosureOfInventoryAbstract" name="DisclosureOfInventoryAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_TransportationTravelAndAccommodation" name="TransportationTravelAndAccommodation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="omse_DeferredTaxAssetsNotRecognizedExplanatoryTextBlock" name="DeferredTaxAssetsNotRecognizedExplanatoryTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_OMSETINCMember" name="OMSETINCMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_PYOiltoolsSdnBhdMember" name="PYOiltoolsSdnBhdMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_DisclosureOfReconciliationOfChangesInIntangibleAssetsOtherThanGoodwillTextBlock" name="DisclosureOfReconciliationOfChangesInIntangibleAssetsOtherThanGoodwillTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_AdditionalTaxAndZakatPayableFromTaxAssessment" name="AdditionalTaxAndZakatPayableFromTaxAssessment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="omse_NetChangeInInventories" name="NetChangeInInventories" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="omse_LeaseLineItems" name="LeaseLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_IncreaseDecreaseThroughTransferredToTradeReceivables" name="IncreaseDecreaseThroughTransferredToTradeReceivables" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="omse_ForeignCurrencyExposureAbstract" name="ForeignCurrencyExposureAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_DisclosureOfAmountDueFromRelatedPartyExplanatory" name="DisclosureOfAmountDueFromRelatedPartyExplanatory" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_ClosingForeignExchangeRateCalculatedUsingReportingCurrency" name="ClosingForeignExchangeRateCalculatedUsingReportingCurrency" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="omse_IncreaseDecreaseInPaymentOfInterestArisingFromFinancingActivities" name="IncreaseDecreaseInPaymentOfInterestArisingFromFinancingActivities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="omse_ImpactOfDifferentTaxRateInOtherJurisdiction" name="ImpactOfDifferentTaxRateInOtherJurisdiction" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_ProvisionForOutstandingTaxDispute" name="ProvisionForOutstandingTaxDispute" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="omse_ReversalOfAllowanceForInventoriesObsolescence" name="ReversalOfAllowanceForInventoriesObsolescence" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="omse_SharesAuthorised" name="SharesAuthorised" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="omse_ConvertibleBondInvestorsMember" name="ConvertibleBondInvestorsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_FinanceCostsAbstract" name="FinanceCostsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_IDRTenPercentWeakeningMember" name="IDRTenPercentWeakeningMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_ConcentrationOfCreditRiskPercentage" name="ConcentrationOfCreditRiskPercentage" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="omse_EffectOfChangesInForeignExchangeRates" name="EffectOfChangesInForeignExchangeRates" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="omse_AccumulatedAmortisationAndImpairmentLossesMember" name="AccumulatedAmortisationAndImpairmentLossesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_WeightedAverageSharesBasicAndDilutedWithDilutiveEffectOfAllInstruments" name="WeightedAverageSharesBasicAndDilutedWithDilutiveEffectOfAllInstruments" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_CapitalContribution" name="CapitalContribution" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="omse_IDRTenPercentStrengtheningMember" name="IDRTenPercentStrengtheningMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_SurfaceWellheadAndChristmasTreeMember" name="SurfaceWellheadAndChristmasTreeMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_LeaseLiabilitiesOriginalCurrency" name="LeaseLiabilitiesOriginalCurrency" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_ProvisionsMember" name="ProvisionsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_DisclosureOfClassificationOfLiabilitiesAsCurrentOrNoncurrentTextBlock" name="DisclosureOfClassificationOfLiabilitiesAsCurrentOrNoncurrentTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_MovementInDeferredTaxAssetsMember" name="MovementInDeferredTaxAssetsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_DisclosureOfTermsAndDebtRepaymentScheduleTableTextBlock" name="DisclosureOfTermsAndDebtRepaymentScheduleTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_OMSHoldingsPteLtdMember" name="OMSHoldingsPteLtdMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_SumitomoCorporationAsiaOceaniaPteLtdMember" name="SumitomoCorporationAsiaOceaniaPteLtdMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_ProceedsFromLoansFromRelatedParties" name="ProceedsFromLoansFromRelatedParties" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="omse_RFDynamicFundAndVielinkAsiaPteLtdMember" name="RFDynamicFundAndVielinkAsiaPteLtdMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_TerminationOfLeaseLiabilities" name="TerminationOfLeaseLiabilities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="omse_CaymanAndOthersMember" name="CaymanAndOthersMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_DisclosureOfSellingGeneralAndAdministrativeExpenseExplanatory" name="DisclosureOfSellingGeneralAndAdministrativeExpenseExplanatory" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_DisclosureOfNatureOfRelatedPartyRelationshipExplanatory" name="DisclosureOfNatureOfRelatedPartyRelationshipExplanatory" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_CurrentDeposits" name="CurrentDeposits" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="omse_RelatedPartyTransactionsAmountPayableSettlementPeriod" name="RelatedPartyTransactionsAmountPayableSettlementPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_DisclosureOfOtherIncomeExpensesNetExplanatory" name="DisclosureOfOtherIncomeExpensesNetExplanatory" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_DescriptionOfAccountingPolicyForStandardsIssuedButNotYetEffectiveExplanatoryPolicyTextBlock" name="DescriptionOfAccountingPolicyForStandardsIssuedButNotYetEffectiveExplanatoryPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_LeaseLiabilitiesInterestRate" name="LeaseLiabilitiesInterestRate" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="omse_ImpactOfDifferentTaxRateInOtherJurisdictionAmount" name="ImpactOfDifferentTaxRateInOtherJurisdictionAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="omse_NumberOfReportableSegments1" name="NumberOfReportableSegments1" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_DeferredTaxAssetsAllowance" name="DeferredTaxAssetsAllowance" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="omse_DerecognitionOfEquityMethodInvestmentsUponDisposalOfAssociates" name="DerecognitionOfEquityMethodInvestmentsUponDisposalOfAssociates" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="omse_DisclosureOfAmountsRecognizedInProfitOrLossExplanatory" name="DisclosureOfAmountsRecognizedInProfitOrLossExplanatory" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_USDTenPercentStrengtheningMember" name="USDTenPercentStrengtheningMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_ServicesTransferredAtAPointInTimeMember" name="ServicesTransferredAtAPointInTimeMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_MaterialAccountingPoliciesDetailsTable" name="MaterialAccountingPoliciesDetailsTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_DeferredOfferingCostsNoncurrent" name="DeferredOfferingCostsNoncurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="omse_InterestIncomeFromAmountDueFromRelatedParties" name="InterestIncomeFromAmountDueFromRelatedParties" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="omse_OtherAssetsRecognisedAsOfAcquisitionDate" name="OtherAssetsRecognisedAsOfAcquisitionDate" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="omse_ZATCAMember" name="ZATCAMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_TopPentagonSdnBhdMember" name="TopPentagonSdnBhdMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_OrganizationAndPrincipalActivitiesAbstract" name="OrganizationAndPrincipalActivitiesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_NumberOfSharesIssuedNew" name="NumberOfSharesIssuedNew" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="omse_AccruedInterest" name="AccruedInterest" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="omse_TradePayableSettlementTerm" name="TradePayableSettlementTerm" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_DisclosureOfForeignCurrencyExposureExplanatory" name="DisclosureOfForeignCurrencyExposureExplanatory" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_PTOMSOilfieldServicesIndonesiaMember" name="PTOMSOilfieldServicesIndonesiaMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_IncreaseDecreaseThroughPaymentOfLeaseLiabilitiesArisingFromFinancingActivities" name="IncreaseDecreaseThroughPaymentOfLeaseLiabilitiesArisingFromFinancingActivities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="omse_LaterThanSixYearsMember" name="LaterThanSixYearsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_DisclosureOfDetailedInFormationAboutReconciliationOfEffectiveTaxRateExplanatoryTextBlock" name="DisclosureOfDetailedInFormationAboutReconciliationOfEffectiveTaxRateExplanatoryTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_PercentageOfWarrantsIssuedToTotalOrdinarySharesIssued" name="PercentageOfWarrantsIssuedToTotalOrdinarySharesIssued" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="omse_DisclosureOfGoodsOrServicesRenderedToRelatedPartiesExplanatory" name="DisclosureOfGoodsOrServicesRenderedToRelatedPartiesExplanatory" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_ConvertibleNoteInterestRate" name="ConvertibleNoteInterestRate" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="omse_MovementInDeferredTaxBalanceLineItems" name="MovementInDeferredTaxBalanceLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_ForeignCurrencyExposure" name="ForeignCurrencyExposure" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="omse_OMSETPLMember" name="OMSETPLMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_InitialPublicOfferingMember" name="InitialPublicOfferingMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_TradeAndOtherPayablesMember" name="TradeAndOtherPayablesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_LoansAndBorrowingsMember" name="LoansAndBorrowingsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_DeferredTaxAssetsNetOperatingLossCarryforwards" name="DeferredTaxAssetsNetOperatingLossCarryforwards" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="omse_NonCurrentPrepaymentsAndOtherNonCurrentAssets" name="NonCurrentPrepaymentsAndOtherNonCurrentAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="omse_IncreaseInDefinedBenefitObligationDueToDecreaseInActuarialAssumptionOfDiscountRate" name="IncreaseInDefinedBenefitObligationDueToDecreaseInActuarialAssumptionOfDiscountRate" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="omse_DisclosureOfDetailedInformationAboutDetailsOfSubsidiariesExplanatoryTextBlock" name="DisclosureOfDetailedInformationAboutDetailsOfSubsidiariesExplanatoryTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_LoansAndBorrowingsArisingFromFinancingActivitiesEndingBalance" name="LoansAndBorrowingsArisingFromFinancingActivitiesEndingBalance" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="omse_PurchaseConsiderationPaidReceived" name="PurchaseConsiderationPaidReceived" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="omse_OthersMember" name="OthersMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_DisclosureOfTradeAndOtherPayablesExplanatoryTableTextBlock" name="DisclosureOfTradeAndOtherPayablesExplanatoryTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_ImpairmentOfCWIPMember" name="ImpairmentOfCWIPMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_SharesIssuedInConversionOfConvertibleNote" name="SharesIssuedInConversionOfConvertibleNote" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_ComputerAndOfficeEquipmentMember" name="ComputerAndOfficeEquipmentMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_OMSPLMember" name="OMSPLMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_PremiumThreadingServicesMember" name="PremiumThreadingServicesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_ConversionOfConvertibleNotesToShares" name="ConversionOfConvertibleNotesToShares" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_RepaymentOfAmountDueToFormerRelatedPartyAndLoansAndBorrowings" name="RepaymentOfAmountDueToFormerRelatedPartyAndLoansAndBorrowings" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="omse_DisclosureOfCategoriesOfFinancialInstrumentsExplanatory" name="DisclosureOfCategoriesOfFinancialInstrumentsExplanatory" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_ConversionOfConvertibleNotesShares" name="ConversionOfConvertibleNotesShares" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_OtherPayablesAverageTerm" name="OtherPayablesAverageTerm" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_OMSOilfieldServicesArabiaLtdMember" name="OMSOilfieldServicesArabiaLtdMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_NumberOfSharesAcquired" name="NumberOfSharesAcquired" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="omse_DisclosureOfDetailedInformationAboutAmountsRecognizedInProfitOrLossTableTextBlock" name="DisclosureOfDetailedInformationAboutAmountsRecognizedInProfitOrLossTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_LoanFromFormerRelatedPartyMember" name="LoanFromFormerRelatedPartyMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_Liability-RelatedOtherChanges" name="Liability-RelatedOtherChanges" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="omse_FinanceIncomeAbstract" name="FinanceIncomeAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_OtherItemsMember" name="OtherItemsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_TaxEffectOfBargainPurchaseGain" name="TaxEffectOfBargainPurchaseGain" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="omse_CategoriesOfFinancialAssetsAndLiabilitiesAbstract" name="CategoriesOfFinancialAssetsAndLiabilitiesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_DisclosureOfAmountsRecognizedInStatementsOfCashFlowsExplanatory" name="DisclosureOfAmountsRecognizedInStatementsOfCashFlowsExplanatory" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_OtherLiabilitiesRecognisedAsOfAcquisitionDate" name="OtherLiabilitiesRecognisedAsOfAcquisitionDate" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="omse_TransactionsWithOwnersOfTheCompanyAbstract" name="TransactionsWithOwnersOfTheCompanyAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_AdditionalTaxLiability" name="AdditionalTaxLiability" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="omse_FixedDepositsPlacedAsCollateral" name="FixedDepositsPlacedAsCollateral" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="omse_DeferredTaxLiabilityAbstract" name="DeferredTaxLiabilityAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_DisclosureOfDetailedInformationAboutPrepaymentsAndOtherAssetsExplanatoryTextBlock" name="DisclosureOfDetailedInformationAboutPrepaymentsAndOtherAssetsExplanatoryTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_DescriptionOfAccountingPolicyForCurrentTaxExplanatory" name="DescriptionOfAccountingPolicyForCurrentTaxExplanatory" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_LessThanOneMonthMember" name="LessThanOneMonthMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_DisclosureOfIncomeAndExpensesExplanatory" name="DisclosureOfIncomeAndExpensesExplanatory" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_PaymentsToRelatedParties" name="PaymentsToRelatedParties" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="omse_DisclosureOfFinanceIncomeProvidedByRelatedPartiesExplanatory" name="DisclosureOfFinanceIncomeProvidedByRelatedPartiesExplanatory" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_DecreaseInDefinedBenefitObligationDueToDecreaseInActuarialAssumptionOfFutureSalaryGrowth" name="DecreaseInDefinedBenefitObligationDueToDecreaseInActuarialAssumptionOfFutureSalaryGrowth" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="omse_USDTenPercentWeakeningMember" name="USDTenPercentWeakeningMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_InterestExpensesFromAmountDueToRelatedParties" name="InterestExpensesFromAmountDueToRelatedParties" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="omse_RightOfUseAssetsRecognisedAsOfAcquisitionDate" name="RightOfUseAssetsRecognisedAsOfAcquisitionDate" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="omse_DeferredTaxAssetsNotRecognizedAbstract" name="DeferredTaxAssetsNotRecognizedAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_OMSOilfieldServicesSdnBhdMember" name="OMSOilfieldServicesSdnBhdMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_IncreaseInDefinedBenefitObligationDueToIncreaseInActuarialAssumptionOfFutureSalaryGrowth" name="IncreaseInDefinedBenefitObligationDueToIncreaseInActuarialAssumptionOfFutureSalaryGrowth" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="omse_DisclosureOfMovementInEmployeesRetirementBenefitsExplanatory" name="DisclosureOfMovementInEmployeesRetirementBenefitsExplanatory" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_SumitomoCorporationMember" name="SumitomoCorporationMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_AllowanceForReversalOfInventoriesObsolescence" name="AllowanceForReversalOfInventoriesObsolescence" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="omse_HowcoMetalsManagementPteLtdMember" name="HowcoMetalsManagementPteLtdMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_RepaymentFromLoanToRelatedParties" name="RepaymentFromLoanToRelatedParties" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="omse_MaterialAccountingPoliciesDetailsLineItems" name="MaterialAccountingPoliciesDetailsLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_LeasePeriod" name="LeasePeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_MaterialAccountingPoliciesDetailsAbstract" name="MaterialAccountingPoliciesDetailsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_ForeignCurrencyExposureLineItems" name="ForeignCurrencyExposureLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_MovementInDeferredTaxBalancesAbstract" name="MovementInDeferredTaxBalancesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_DeferredTaxAssetAllowances" name="DeferredTaxAssetAllowances" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="omse_SumitomoCorporationMalaysiaSdnBhdMember" name="SumitomoCorporationMalaysiaSdnBhdMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_OMSEnergyTechnologiesPteLtdMember" name="OMSEnergyTechnologiesPteLtdMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_EquityInterestHoldDescription" name="EquityInterestHoldDescription" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_FreightCharges" name="FreightCharges" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="omse_RelatedPartyTransactionsAmountReceivableSettlementPeriod" name="RelatedPartyTransactionsAmountReceivableSettlementPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_IncreaseDecreaseInterestRateRiskBasisPoint" name="IncreaseDecreaseInterestRateRiskBasisPoint" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_DisclosureOfDetailedInformationAboutRestrictedCashAndCashEquivalentExplanatory" name="DisclosureOfDetailedInformationAboutRestrictedCashAndCashEquivalentExplanatory" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_CashPaymentForManagementBuyout" name="CashPaymentForManagementBuyout" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="omse_DisclosureOfMovementsInDeferredTaxBalancesExplanatoryTextBlock" name="DisclosureOfMovementsInDeferredTaxBalancesExplanatoryTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_InterestBearingLiabilities" name="InterestBearingLiabilities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="omse_TradeReceivablesAndOtherAssetsMember" name="TradeReceivablesAndOtherAssetsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_ChangeInDefinedBenefitObligationDueToReasonablyPossibleIncreaseInActuarialAssumptionOnDiscountRate" name="ChangeInDefinedBenefitObligationDueToReasonablyPossibleIncreaseInActuarialAssumptionOnDiscountRate" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_CashAndCashEquivalentMember" name="CashAndCashEquivalentMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_CapitalAdvancesFromPotentialInvestors" name="CapitalAdvancesFromPotentialInvestors" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="omse_CashCashEquivalentsAndCashRestrictedCash" name="CashCashEquivalentsAndCashRestrictedCash" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="omse_DisclosureOfOrganizationAndPrincipalActivitiesExplanatoryTextBlock" name="DisclosureOfOrganizationAndPrincipalActivitiesExplanatoryTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_TradeAndOtherPayablesLineItems" name="TradeAndOtherPayablesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_LegacyCashPoolingArrangementPrincipalBalance" name="LegacyCashPoolingArrangementPrincipalBalance" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="omse_EdgenMurrayPteLtdMember" name="EdgenMurrayPteLtdMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_PremisesCosts" name="PremisesCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="omse_SumitomoCorporationCapitalAsiaPteLtdMember" name="SumitomoCorporationCapitalAsiaPteLtdMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_SpecialtyConnectorsAndPipesMember" name="SpecialtyConnectorsAndPipesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_ScheduleOfAmountsRecognizedInStatementsOfCashFlowsAbstract" name="ScheduleOfAmountsRecognizedInStatementsOfCashFlowsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_DisclosureOfOtherComprehensiveIncomeByItemExplanatoryTextBlock" name="DisclosureOfOtherComprehensiveIncomeByItemExplanatoryTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_ChangeInDefinedBenefitObligationDueToReasonablyPossibleDecreaseInActuarialAssumptionOnDiscountRate" name="ChangeInDefinedBenefitObligationDueToReasonablyPossibleDecreaseInActuarialAssumptionOnDiscountRate" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_EquipmentCosts" name="EquipmentCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="omse_PaymentOfAdditionalTaxLiability" name="PaymentOfAdditionalTaxLiability" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="omse_LeaseTable" name="LeaseTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_CapitalContributionShares" name="CapitalContributionShares" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_FixedAssetsDepreciationMember" name="FixedAssetsDepreciationMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_OMSOilfieldServicesThailandLtdMember" name="OMSOilfieldServicesThailandLtdMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_SCTubularSolutionsMalaysiaSdnBhdMember" name="SCTubularSolutionsMalaysiaSdnBhdMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_DescriptionOfAccountingPolicyForContractAssetsExplanatoryPolicyTextBlock" name="DescriptionOfAccountingPolicyForContractAssetsExplanatoryPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_LeaseLiabilitiesMaturity" name="LeaseLiabilitiesMaturity" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_DecreaseInDefinedBenefitObligationDueToIncreaseInActuarialAssumptionOfDiscountRate" name="DecreaseInDefinedBenefitObligationDueToIncreaseInActuarialAssumptionOfDiscountRate" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="omse_DisclosureOfOperatingLeaseLiabilitiesExplanatory" name="DisclosureOfOperatingLeaseLiabilitiesExplanatory" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_DisclosureOfGoodsOrServicesProvidedByRelatedPartiesExplanatory" name="DisclosureOfGoodsOrServicesProvidedByRelatedPartiesExplanatory" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_DeferredTaxAssetsAbstract" name="DeferredTaxAssetsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_RestrictedCashAndCashEquivalentAbstract" name="RestrictedCashAndCashEquivalentAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_DeferredTaxAssetsNotRecognized" name="DeferredTaxAssetsNotRecognized" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="omse_BargainPurchaseGainMember" name="BargainPurchaseGainMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_DisclosureOfTradeReceivablesExplanatory" name="DisclosureOfTradeReceivablesExplanatory" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_AllotmentOfOrdinaryShares" name="AllotmentOfOrdinaryShares" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="omse_ChangesInOperatingAssetsAndLiabilitiesAbstract" name="ChangesInOperatingAssetsAndLiabilitiesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_IncomeStatementLineItems" name="IncomeStatementLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_EffectOfExchangeRateChangesOnCashCashEquivalentsAndRestrictedCash" name="EffectOfExchangeRateChangesOnCashCashEquivalentsAndRestrictedCash" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="omse_TaxProvisionRecognisedAsOfAcquisitionDate" name="TaxProvisionRecognisedAsOfAcquisitionDate" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="omse_DisclosureOfOtherIncomeExpensesByRelatedPartiesExplanatory" name="DisclosureOfOtherIncomeExpensesByRelatedPartiesExplanatory" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="omse_RepaymentOfLoansDueToFormerRelatedParty" name="RepaymentOfLoansDueToFormerRelatedParty" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="omse_ThaiBahtMember" name="ThaiBahtMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="omse_ScheduleOfInventoriesTextBlock" name="ScheduleOfInventoriesTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
</xsd:schema>
