`BR-DEX-01`

EN 16931 · validation rule

EN 16931Error

An attached document (BT-125) uses a MIME code that XRechnung does not allow. Allowed: application/pdf, image/png, image/jpeg, text/csv, the xlsx and ods spreadsheet types, and (extension profile only) application/xml. The sender must convert the attachment or fix the mimeCode attribute.

Field: attachments[].mime_type (BT-125-1)
Rule set: EN 16931
Rule-set version: EN 16931 validation artefacts 1.3.17 · in force since 2026-10-13 · 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/BR-DEX-01?lang=en