ValidateFin

PEPPOL-EN16931-CL001 - Attachment MIME type must come from the allowed list

The MIME type declared for an embedded attachment (BT-125) must belong to the restricted subset of the IANA media type registry accepted by Peppol. Free-form or exotic media types are rejected.

PEPPOL-EN16931-CL001 - Attachment MIME type must come from the allowed list

The MIME type declared for an embedded attachment (BT-125) must belong to the restricted subset of the IANA media type registry accepted by Peppol. Free-form or exotic media types are rejected. This is a Peppol BIS Billing 3.0 rule. It applies on top of the EN 16931 core standard, on invoices exchanged over the Peppol network.

Code listsPeppol BIS 3.0BT-125 Error
This is a Peppol BIS Billing 3.0 rule. It applies on top of the EN 16931 core standard, on invoices exchanged over the Peppol network.

What this rule checks

The MIME type declared for an embedded attachment (BT-125) must belong to the restricted subset of the IANA media type registry accepted by Peppol. Free-form or exotic media types are rejected.

How to fix it

Set the mimeCode attribute of cbc:EmbeddedDocumentBinaryObject to an accepted value such as application/pdf, image/png, image/jpeg or text/csv.

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: OpenPeppol BIS Billing 3.0 · Last verified: 2026-07-10

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