[IBR-013-OM] - Supporting document reference (IBT-122) and Supporting document UUID (BTOM-023) must be provided if invoice transaction type (BTOM-001) is export invoice (XXXXXX1XXXXXXXXXXXXX) and at least one VAT exemption reason code (IBT-121) is 'Re-export of goods (VATZR-OM-12)'.
IBR-013-OMubl:Invoice | cn:CreditNotenot($isExport and $lines//cbc:TaxExemptionReasonCode ='VATZR-OM-12') or (exists($doc/cac:AdditionalDocumentReference [not(cbc:DocumentTypeCode='130')] [cbc:ID and cbc:UUID]))