# PEPPOL-T16-B01403

Source: https://xmlvalid.com/rules/PEPPOL-T16-B01403

> Attribute 'filename' MUST be present.

- Level: error
- Rule sets: Peppol Despatch Advice rules 3.5
- Context: `/ubl:DespatchAdvice/cac:AdditionalDocumentReference/cac:Attachment/cbc:EmbeddedDocumentBinaryObject`
- Test: `@filename`

Validate a document against these rules: https://xmlvalid.com/validate