[UBL-CR-521]-A UBL invoice should not include the InvoiceLine InvoicePeriod EndTime
UBL-CR-521
pxs-taxdata:TaxData/pxs-taxdata:ReportedTransaction/pxs-taxdata:ReportedDocument
not(pxs-taxdata:DocumentLine/cac:InvoicePeriod/cbc:EndTime)