# PEPPOL-T19-B20201

Source: https://xmlvalid.com/rules/PEPPOL-T19-B20201

> Element 'cbc:URI' MUST be provided.

- Level: error
- Rule sets: Peppol Catalogue rules 3.5
- Context: `/ubl:Catalogue/cac:CatalogueLine/cac:Item/cac:ItemSpecificationDocumentReference/cac:Attachment/cac:ExternalReference`
- Test: `cbc:URI`

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