errorEN16931
BR-CL-24:For Mime code in attribute use MIMEMediaType.
An attachment MIME type is not valid. MIME types identify file formats like application/pdf, image/png, text/csv.
We can fix this automatically
AUTO-FIXAuto-fix: Map file extensions to MIME types (.pdf→application/pdf, .png→image/png). Normalize common variations and typos.
No manual changes needed
Upload and Fix NowWhy This Error Matters
Invoice rejected. Attachments must have valid MIME types for proper handling.
Common Causes
- MIME code not from IANA media types list
- Custom or invalid mimeCode on attachment
- MIME type format incorrect (should be type/subtype)
- File extension used instead of MIME type
- Legacy attachment type not mapped to IANA media types
Frequently Asked Questions
BR-CL-24 occurs when an attachment's MIME type code is not valid. Valid codes include application/pdf, image/png, image/jpeg, text/csv, and other IANA registered media types.
Update the mimeCode attribute in the EmbeddedDocumentBinaryObject element to use a valid IANA media type that matches your file format.
Yes, BR-CL-24 is a code list violation that will cause invoice rejection. Attachments must have valid MIME types for proper processing.
In some cases. Invoice Navigator can detect common file extensions and suggest the correct MIME type, but manual verification is recommended for unusual file formats.
See Also
Last updated: 17 January 2026
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