UQ: Under query
What it means
Peppol status UQ in an Invoice Response means the buyer will not go on to accept the invoice until the seller gives more information.
The usual cause
The buyer has a question about the invoice; the response carries a reason code, an explanation or both saying what it is, for example REF for missing references.
How to fix it
Answer the buyer's question outside Peppol, by the means you agreed with them. The buyer may then continue processing or raise further questions.
Once the file is corrected, check it again for free: Validate a Peppol BIS invoice
Or fix the invoice in a form and download the corrected file, for 1 credit: Fix a rejected e-invoice
The code as published
Read the official document . Source: Peppol BIS Invoice Response 3.1 (BIS 63A), with its code lists, version Peppol BIS 3, 2026-Q2 release, published by OpenPeppol AISBL, read on 8 November 2026.
Klarbon explains each code in its own words; the official wording is in the document linked above.
Look at your file
Check the invoice against the rules this portal applies: Validate a Peppol BIS invoice. Validate a Peppol BIS invoice