ValidateFin

BR-DEX-01 - Attachment MIME code must be allowed

The Attached document (BT-125) uses a MIME code that is not permitted. In the XRechnung Extension, application/xml may be used in addition to the standard list of MIME codes.

BR-DEX-01 - Attachment MIME code must be allowed

The Attached document (BT-125) uses a MIME code that is not permitted. In the XRechnung Extension, application/xml may be used in addition to the standard list of MIME codes. This is an XRechnung rule (German KoSIT CIUS). It applies on top of EN 16931 and Peppol, and is mandatory for B2G invoicing in Germany.

Code listsXRechnungBT-125 Error
This is an XRechnung rule (German KoSIT CIUS). It applies on top of EN 16931 and Peppol, and is mandatory for B2G invoicing in Germany.

What this rule checks

The Attached document (BT-125) uses a MIME code that is not permitted. In the XRechnung Extension, application/xml may be used in addition to the standard list of MIME codes.

How to fix it

Convert the attachment or set its mimeCode attribute to an allowed value.

Validate against this rule

This rule is part of EN 16931. Check your invoice with the validator that matches your format:

UBL / PeppolXRechnungFactur-X / ZUGFeRD

Related rules

BR-CL-01Invoice type code: UNTDID 1001BR-CL-03Amount currency (@currencyID): ISO 4217BR-CL-04Invoice currency code: ISO 4217BR-CL-05VAT accounting currency code: ISO 4217BR-CL-06VAT point date code: UNTDID 2005BR-CL-07Object identifier scheme: UNTDID 1153

Source: KoSIT XRechnung · Last verified: 2026-07-10

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