[IBR-020-OM] - Buyer country code (IBT-055) MUST be 'OM' when the Invoice transaction type (BTOM-001) is a Self-billed Invoice/credit note (XX1XXXXXXXXXXXXXXXXX) or Invoice for import of services for RCM (XXXXXXXX1XXXXXXXXXXX) or Profit Margin Self-Invoice ( 00000000001000000000) or Import of Goods (XXXXXXXXXXXX1XXXXXXX).
IBR-020-OMubl:Invoice | cn:CreditNotenot($isSelfBilled or $isImportRCM or $isProfitMargin or $isImportGoods) or cac:AccountingCustomerParty/cac:Party/cac:PostalAddress/cac:Country/cbc:IdentificationCode='OM'