warningEN 16931syntax binding ruleUBL
A UBL invoice should not include the BillingReference UUID
The element 'BillingReference UUID' is present, but it carries no meaning in the EN 16931 semantic model, so a receiver is free to ignore or reject it.
Remove 'BillingReference UUID' from the document. Nothing in EN 16931 maps to it - it is almost always left over from a generic UBL template. Reported as a warning.
UBL — context /ubl:Invoice | /cn:CreditNote
not(cac:BillingReference/cac:InvoiceDocumentReference/cbc:UUID)