What causes the UBL-SR-01 error?

UBL documents must declare correct namespace.

How do I fix UBL-SR-01?

Add correct UBL 2.1 namespace declaration. Invoice Navigator can propose a fix for this error, which you review and confirm before it is applied.

Yes, UBL-SR-01 is a critical error that will cause invoice rejection. It must be fixed before submission.

UBL-SR-01In your invoicing software

This is the rejection, word for word: „[UBL-SR-01] Your invoice contains multiple contract identifiers. EN16931 allows only one contract identifier.“

What to have readyNothing. The file has to be re-exported from your invoicing software; we check it again afterwards.

What we doAdd correct UBL 2.1 namespace declaration.

Choose the rejected invoiceor drop it here

XRechnung XML or ZUGFeRD PDF. Checking is free · corrected file €1.90 · the first every 30 days is free · no sign-up.

What the finding looks likeExample

FindingStructure invalid · UBL-SR-01

Location/Invoice/cac:ContractDocumentReference

From youA re-exported file

ThenRe-export

ProofSHA-256 and /verify link after the check

Often appears together with