public enum OperationCodeTypeEnum { octSummaryInvoicesEntry, octSummaryReceiptsEntry, octInvoicewithSeveralVATRates, octCorrectionInvoice, octDueVATPendingInvoiceIssuance, octExpensesIncurredbyTravelAgentforCustomers, octSpecialRegulationforVATGroup, octSpecialRegulationforGoldInvestment, octReverseChargeProcedure, octUnsummarizedReceipts, octIdentificationofErrorTransactions, octTransactionswithEntrepreneursIssuingReceiptsforAgriculturalCompensation, octServiceInvoicingbyTravelAgenciesonBehalfofThirdParties, octBusinessOfficeRental, octSubsidies, octIncomingPaymentsforIndustrialandIntellectualPropertyRights, octInsuranceTransactions, octPurchasesfromTravelAgencies, octTransactionsSubjecttoProductionServiceandImportTaxesinCeutaandMelilla }