[UBL-CR-036]-A UBL invoice should not include the BillingReference IssuerParty
UBL-CR-036
pxs-taxdata:TaxData/pxs-taxdata:ReportedTransaction/pxs-taxdata:ReportedDocument
not(cac:BillingReference/cac:InvoiceDocumentReference/cac:IssuerParty)