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Warning

UBL-CR-125: Leave the file type out of an attachment link

In short

Warning: worth checking.

UBL-CR-125 means a document link in your UBL invoice or credit note states a file type (MimeCode), which EN 16931 does not use for links. Remove that element. If you attach the document instead of linking to it, the file type belongs on the attachment itself.

On this page

What it means

This rule checks that cbc:MimeCode is absent from document-level cac:AdditionalDocumentReference/cac:Attachment/cac:ExternalReference in a UBL invoice or credit note. It applies to every additional document reference, including supporting documents (BG-24). An embedded document carries its file type as the mimeCode attribute of cbc:EmbeddedDocumentBinaryObject (BT-125). That attribute is outside this check.

Why it matters

The external document-link structure used by EN 16931 does not include this file-type element.

How to fix it

Remove cbc:MimeCode from cac:AdditionalDocumentReference/cac:Attachment/cac:ExternalReference. If you embed the document instead, keep the mimeCode attribute on cbc:EmbeddedDocumentBinaryObject and make sure it matches the real file. Export the corrected file and check it again.

Once the file is corrected, check it again for free: Validate an invoice against EN 16931

Or fix the invoice in a form and download the corrected file, for 1 credit: Fix a rejected e-invoice

The rule as published

A UBL invoice should not include the AdditionalDocumentReference Attachment External MimeCode

Where this rule applies

Rule set Version
EN 16931 (UBL) 1.3.17
EN 16931 (UBL credit note) 1.3.17
XRechnung 3.0 (UBL) 3.0.2
XRechnung 3.0 (UBL credit note) 3.0.2
Peppol BIS Billing 3.0 (invoice) 2026.5
Peppol BIS Billing 3.0 (credit note) 2026.5
SI-UBL 2.0 / NLCIUS (invoice) 2.0.3.13
SI-UBL 2.0 / NLCIUS (credit note) 2.0.3.13
France CTC (UBL invoice) 1.4.0-04
France CTC (UBL credit note) 1.4.0-04
CIUS-RO UBL Invoice 1.0.9 1.0.9
CIUS-RO UBL Credit Note 1.0.9 1.0.9
Rule text from phive-rules 4.6.4.

Check your file

Drop your e-invoice to see whether UBL-CR-125 still fails, and which other rules do.

Updated 6 November 2026