Message

Document MUST NOT contain elements not part of the data model.

Context
/ubl:Catalogue/cac:CatalogueLine/cac:Item/cac:ItemSpecificationDocumentReference/cac:Attachment/cac:ExternalReference/*
Test
false()
Usage
/ ubl:Catalogue / cac:CatalogueLine / cac:Item / cac:ItemSpecificationDocumentReference / cac:Attachment / cac:ExternalReference