`PEPPOL-EN16931-CL001`

Peppol BIS Billing 3 · validation rule

Peppol BIS Billing 3Error

The MIME code of an attachment (BT-125-1) is not in the Peppol/EN 16931 subset: application/pdf, image/png, image/jpeg, text/csv, application/vnd.openxmlformats-officedocument.spreadsheetml.sheet, application/vnd.oasis.opendocument.spreadsheet. The sender must convert the file or fix mimeCode.

Field: attachments[].mime_type (BT-125-1)
Rule set: Peppol BIS Billing 3
Rule-set version: Peppol BIS Billing 3.0 (rules master, Sep 2026) · in force since 2026-09-07 · Rule-set changelog
Who has to fix it: The sender

This is a property of the file you received, so it cannot be corrected on your side without changing the document — ask the supplier to reissue it.

Check your own invoice

Drop the file that failed. We parse it, run the official rule sets against it and list every finding with a fix — 20 invoices per day, no key, nothing stored.

Open the live demo

Same explanation over the API: GET /v1/rules/PEPPOL-EN16931-CL001?lang=en