[IBR-056-OM] - The scheme identifier (IBT-158-1) MUST be 'HS' or 'MP' when Item classification identifier (IBT-158) is provided. Use 'HS' for goods (Oman HS code list) and 'MP' for services (Service Type code list, CL-12-OM).
IBR-056-OMcac:InvoiceLine | cac:CreditNoteLinenot(cac:Item/cac:CommodityClassification/cbc:ItemClassificationCode) or cac:Item/cac:CommodityClassification/cbc:ItemClassificationCode/@listID = ('HS','MP')