[IBR-174-OM] - Item classification identifier (HS Code) (IBT-158) should be provided from the Harmonized System (HS) Code list published by the Royal Oman Police (Directorate General of Customs) when Goods or Services identification (BTOM-019) is 'G' (Goods).
IBR-174-OMcac:InvoiceLine | cac:CreditNoteLinenot(cac:Item/cac:ItemSpecificationDocumentReference[cbc:ID/@schemeName='MP']/cbc:DocumentTypeCode='G') or cac:Item/cac:CommodityClassification/cbc:ItemClassificationCode[@listID='HS']