XRechnung 2.1.0 · UBLStored validation assertion
UBL-CR-531
XRechnung 2.1.0 · UBL
warningschema
Original rule text
[UBL-CR-531]-A UBL invoice should not include the InvoiceLine BillingReference
not((cac:InvoiceLine|cac:CreditNoteLine)/cac:BillingReference)