What causes the UBL-CR-001 error?

The invoice XML is not well-formed. This means the XML structure has errors like unclosed tags or invalid characters.

How do I fix UBL-CR-001?

Fix the XML syntax errors indicated by the parser. You can also use Invoice Navigator's automatic Fixer tool to correct this instantly.

Is UBL-CR-001 a critical error?

Yes, UBL-CR-001 is a critical error that will cause invoice rejection. It must be fixed before submission to ensure your invoice is accepted by the recipient's system.

Can UBL-CR-001 be automatically fixed?

Many instances of UBL-CR-001 can be automatically corrected using Invoice Navigator's Fixer tool. Upload your invoice and the tool will identify and fix common issues, including invalid xml syntax.

Which accounting software causes UBL-CR-001?

UBL-CR-001 is commonly seen in exports from Any XML export - manual or automated. These software packages sometimes generate invoices that need adjustment to meet full compliance standards.

Error codes · UBL 2.1

UBL-CR-001In your invoicing software

Disallowed element: ext:UBLExtensions

This is the rejection, word for word: „[UBL-CR-001] UBL 2.1 Invoice schema does not include `ext:UBLExtensions`. This element must be removed for EN 16931 compliance.“

Parser error

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 `ext:UBLExtensions` element from your Invoice.

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

<Invoice>
  <ext:UBLExtensions>value</ext:UBLExtensions>
</Invoice>

After

<Invoice>
  <!-- ext:UBLExtensions removed for EN 16931 compliance -->
</Invoice>

Element order is part of the rule: if the element sits in the wrong place, the validator rejects with UBL-CR-001.

What the finding looks likeExample

FindingStructure invalid · UBL-CR-001

Location/Invoice/ext:UBLExtensions

From youA re-exported file

ThenRe-export

ProofSHA-256 and /verify link after the check