How do I fix UBL-CR-135?

Invoice Navigator automatically removes the disallowed `cbc:IssueDate` element from your Invoice (UBL-CR-135). You can also use Invoice Navigator's automatic Fixer tool to correct this instantly.

Is UBL-CR-135 a critical error?

Yes, UBL-CR-135 is a critical error that will cause invoice rejection. It must be fixed before submission to ensure your invoice is accepted.

Can UBL-CR-135 be automatically fixed?

Yes, UBL-CR-135 can be automatically corrected. The fix is applied without modifying financial fields.

Error codes · UBL 2.1

UBL-CR-135In your invoicing software

A UBL invoice should not include the ProjectReference IssueDate

This is the rejection, word for word: „[UBL-CR-135] Your invoice contains ProjectReference/IssueDate which is not allowed in EN16931 invoices.“

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

What we doInvoice Navigator automatically removes the disallowed `cbc:IssueDate` element from your Invoice (UBL-CR-135).

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.

If you enter it yourself in your invoicing software

Before

<cac:ProjectReference>
  <cbc:IssueDate>value</cbc:IssueDate>
</cac:ProjectReference>

After

<cac:ProjectReference>
  <!-- cbc:IssueDate removed for EN 16931 compliance -->
</cac:ProjectReference>

Element order is part of the rule: if the element sits in the wrong place, the validator rejects with UBL-CR-135.

What the finding looks likeExample

FindingStructure invalid · UBL-CR-135

Location/Invoice/cac:ProjectReference/cbc:IssueDate

From youA re-exported file

ThenRe-export

ProofSHA-256 and /verify link after the check