[UBL-SR-11]-Seller legal registration identifier shall occur maximum once
UBL-SR-11pxs-taxdata:TaxData/pxs-taxdata:ReportedTransaction/pxs-taxdata:ReportedDocument(count(cac:AccountingSupplierParty/cac:Party/cac:PartyLegalEntity/cbc:CompanyID) <= 1)