BR-DEX-01: attachment (BT-125) with a MIME type not allowed

Your invoice uses the XRechnung extension and contains an attachment whose MIME type is not on the list of permitted types. The norm allows PDF, PNG, JPEG, CSV and spreadsheets in the Excel or OpenDocument format; the extension additionally allows application/xml. Other types such as Word documents, ZIP archives or text/xml are rejected because the recipient cannot process them reliably. Often the software derives the type from the file extension and lands on a value outside the list.

Set in the mimeCode attribute of the embedded object a permitted value: application/pdf, image/png, image/jpeg, text/csv, the two spreadsheet types or application/xml. Convert other documents to PDF before embedding them.

<cac:Attachment>
  <cbc:EmbeddedDocumentBinaryObject mimeCode="text/xml" filename="proof-of-service.xml">PD94bWwgdmVyc2lvbj0iMS4wIj8+</cbc:EmbeddedDocumentBinaryObject>
</cac:Attachment>

<cac:Attachment>
  <cbc:EmbeddedDocumentBinaryObject mimeCode="application/xml" filename="proof-of-service.xml">PD94bWwgdmVyc2lvbj0iMS4wIj8+</cbc:EmbeddedDocumentBinaryObject>
</cac:Attachment>

• A Word, ZIP or e-mail attachment was embedded.
• For XML the type text/xml was set instead of application/xml.
• The MIME type was derived from an extension such as .jpg as image/jpg instead of image/jpeg.