BR-CL-24: For Mime code in attribute use MIMEMediaType

StandardEN 16931-1 (European e-invoicing semantic model)SeverityError: the invoice is rejectedSyntaxUBL, CIIApplies toEvery EN 16931 invoice: XRechnung, ZUGFeRD 2.x / Factur-X (profiles EN 16931, EXTENDED, XRECHNUNG), Peppol BIS Billing 3.0, and national CIUS such as the Dutch NLCIUS or the Italian/Spanish profiles.

Official rule text

[BR-CL-24] For Mime code in attribute use MIMEMediaType.

Why this error occurs

The value must come from a fixed code list and the value in your file is not on it. Common causes: a free-text value instead of a code ("Invoice" instead of 380), a code from an older list version, lower-case codes, or a code valid in another standard but not in this one.

How to fix it

Replace the value with a code from the list named in the rule text (UNTDID 1001 for document types, UNTDID 5305 for VAT categories, ISO 4217 for currencies, ISO 3166-1 for countries, UN/ECE Recommendation 20/21 for units, EAS for electronic addresses, ISO 6523 ICD for scheme identifiers). Codes are case-sensitive.

What the validator checks

Checked element (context):

UBL

cbc:EmbeddedDocumentBinaryObject[@mimeCode]

Test (XPath):

((@mimeCode = 'application/pdf' or @mimeCode = 'image/png' or @mimeCode = 'image/jpeg' or @mimeCode = 'text/csv' or @mimeCode = 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet' or @mimeCode = 'application/vnd.oasis.opendocument.spreadsheet'))

CII

ram:AttachmentBinaryObject[@mimeCode]

Test (XPath):

((@mimeCode = 'application/pdf' or @mimeCode  = 'image/png' or @mimeCode  = 'image/jpeg' or @mimeCode  = 'text/csv' or @mimeCode  = 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet' or @mimeCode  = 'application/vnd.oasis.opendocument.spreadsheet'))

Check your invoice

Drop your XML or PDF on the validator and every failed rule is linked to its page here. Free, no account, the file is not stored.

Check your invoice →

Same check via API:

curl -F file=@invoice.xml https://einvoicechecker.com/v1/validate

Related rules

BR-CL-01 Invoice type code is not a valid UNTDID 1001 code
BR-CL-03 currencyID attribute is not an ISO 4217 code
BR-CL-04 Invoice currency code is not an ISO 4217 code
BR-CL-05 Tax currency code MUST be coded using ISO code list 4217 alpha-3
BR-CL-06 Value added tax point date code MUST be coded using a restriction of UNTDID 2005
BR-CL-07 Object identifier identification scheme identifier MUST be coded using a restriction…
BR-CL-08 Invoiced note subject code shall be coded using UNCL4451
BR-CL-10 Party identifier scheme is not an ISO 6523 ICD code

Frequently asked questions

What does BR-CL-24 mean?

BR-CL-24 is a en 16931 core rule: For Mime code in attribute use MIMEMediaType.

Will my invoice be rejected because of BR-CL-24?

Yes. BR-CL-24 is flagged "fatal"; validators (KoSIT, Peppol access points, the German ZRE/OZG-RE portals) reject the invoice until it is fixed.

Which formats does BR-CL-24 apply to?

Every EN 16931 invoice: XRechnung, ZUGFeRD 2.x / Factur-X (profiles EN 16931, EXTENDED, XRECHNUNG), Peppol BIS Billing 3.0, and national CIUS such as the Dutch NLCIUS or the Italian/Spanish profiles. Syntax: UBL and CII.

Source: EN 16931-1:2017 schematron (CEN TC434, via Peppol BIS 3.0.20). Catalogue generated from the official schematron on 2026-10-14.