UBL-CR-673: A UBL invoice shall not include an AdditionalDocumentReference…
fatalUBL
What this error means and how to fix it
A UBL-CR rule: the invoice contains a UBL element that EN 16931 does not use. Remove the element, or leave it if your recipient accepts it. This is an error: the invoice is rejected until it is fixed.
This error needs information only you have, so it is not repaired automatically. The free check shows every finding in the file with its location; if other errors in the same file are in the automatic set (totals, VAT breakdown, rounding, element order), the result page offers the corrected file for 9 €.
Rule text
[UBL-CR-673]-A UBL invoice shall not include an AdditionalDocumentReference simultaneously referring an Invoice Object Identifier and an Document Description
Where the rule is checked (XPath context and test)