Is AT-01 a critical error?

AT-01 is a warning that may not always cause rejection, but it indicates a potential compliance issue that should be addressed.

Can AT-01 be automatically fixed?

AT-01 affects financial fields and cannot be automatically modified. This must be corrected in the source invoicing system.

Error codes · CIUS-AT · Austria

AT-01Partly

Austrian sellers should include UID number

This is the rejection, word for word: „[AT-01] Austrian sellers should include UID number. This validation rule ensures Invoice compliance with CIUS-AT (Austria).“

What to have readyThe correct figures from your bookkeeping; we show you which field is affected.

What we doReview your Invoice XML structure and correct the issue described by this rule. Check relevant cbc: and cac: elements per CIUS-AT (Austria).

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: Austrian sellers should include UID number -->
</Invoice>

After

<Invoice>
  <!-- Issue resolved per CIUS-AT (Austria) -->
</Invoice>

What the finding looks likeExample

FindingNeeds your check · AT-01

From youThe correct figures

ThenChecked again

ProofSHA-256 and /verify link after the check

Often appears together with

AT-R-002Austrian UID number format invalid AT-R-003Austrian postal code format