warningEN 16931syntax binding ruleUBL
A UBL invoice should not include the SalesOrderID scheme identifier
The element 'SalesOrderID scheme identifier' is present, but it carries no meaning in the EN 16931 semantic model, so a receiver is free to ignore or reject it.
Remove 'SalesOrderID scheme identifier' 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(cbc:SalesOrderID/@schemeID)