Is PEPPOL-EN16931-R080 a critical error?

Yes, PEPPOL-EN16931-R080 is a critical error that will cause invoice rejection. It must be fixed before submission to ensure your invoice is accepted.

Can PEPPOL-EN16931-R080 be automatically fixed?

PEPPOL-EN16931-R080 affects financial fields and cannot be automatically modified. This must be corrected in the source invoicing system.

Which accounting software causes PEPPOL-EN16931-R080?

PEPPOL-EN16931-R080 is commonly seen in exports from All invoicing software. These software packages sometimes generate invoices that need adjustment to meet full compliance standards.

Error codes · EN 16931

PEPPOL-EN16931-R080In your invoicing software

Too many project references

This is the rejection, word for word: „[PEPPOL-EN16931-R080] The invoice has more than one project reference at the document level. Peppol allows only a single project reference per invoice. If your invoice relates to multiple projects, use only the primary one at the document level.“

XPath: cac:ProjectReference — Peppol rule PEPPOL-EN16931-R080. Only one ProjectReference element is allowed at document level.

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

What we doReview your Invoice XML structure and correct the issue described by this rule. Check relevant cbc: and cac: elements per EN 16931 (PEPPOL-EN16931-R080).

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>
  <!-- Issue: Only one project reference is allowed on document level. -->
</Invoice>

After

<Invoice>
  <!-- Issue resolved per EN 16931 -->
</Invoice>

Element order is part of the rule: if the element sits in the wrong place, the validator rejects with PEPPOL-EN16931-R080.

What the finding looks likeExample

FindingStructure invalid · PEPPOL-EN16931-R080

From youA re-exported file

ThenRe-export

ProofSHA-256 and /verify link after the check