BR-52

Every additional supporting document (BG-24) must carry a reference (BT-122) — the number under which the recipient can find the document.

Severity: Error
Applies to: CII, UBL
Rule set: v2026-01-31

Official rule text

Each Additional supporting document (BG-24) shall contain a Supporting document reference (BT-122).

Why does BR-52 happen?

The group is created to carry an attachment, and the attachment has a filename. No identifier is assigned to the document itself, the filename seeming description enough.

How do you fix BR-52?

Set BT-122 in cac:AdditionalDocumentReference/cbc:ID in UBL, ram:AdditionalReferencedDocument/ram:IssuerAssignedID in CII. On filenames being distinct where there are several attachments, see BR-DE-22.

In the XML

A UBL fragment. The CII path is named above — same change, different element names.

Fails

<cac:AdditionalDocumentReference>
  <cac:Attachment>
    <cbc:EmbeddedDocumentBinaryObject mimeCode="application/pdf" filename="stundennachweis.pdf">JVBERi0=</cbc:EmbeddedDocumentBinaryObject>
  </cac:Attachment>
</cac:AdditionalDocumentReference>

Fixed

<cac:AdditionalDocumentReference>
  <cbc:ID>SN-2026-0042</cbc:ID>
  <cac:Attachment>
    <cbc:EmbeddedDocumentBinaryObject mimeCode="application/pdf" filename="stundennachweis.pdf">JVBERi0=</cbc:EmbeddedDocumentBinaryObject>
  </cac:Attachment>
</cac:AdditionalDocumentReference>

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