Message

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

Context
/ubl:OrderResponse/cac:OrderLine/cac:LineItem/cac:Item/cac:ItemSpecificationDocumentReference/cac:Attachment/cac:ExternalReference/*
Test
false()
Usage
/ ubl:OrderResponse / cac:OrderLine / cac:LineItem / cac:Item / cac:ItemSpecificationDocumentReference / cac:Attachment / cac:ExternalReference