[UBL-SR-14]-Seller additional legal information shall occur maximum once
UBL-SR-14pxs-taxdata:TaxData/pxs-taxdata:ReportedTransaction/pxs-taxdata:ReportedDocument(count(cac:AccountingSupplierParty/cac:Party/cac:PartyLegalEntity/cbc:CompanyLegalForm) <= 1)