ITM: Items incorrect
What it means
Peppol reason ITM in an Invoice Response means the items are not as the buyer expected.
The usual cause
The invoice lists items the buyer did not order or receive.
How to fix it
Check the items against the order and correct the invoice as the response asks.
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