Message

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

Context
/ubl:DespatchAdvice/cac:DespatchLine/cac:DocumentReference/cac:Attachment/cac:ExternalReference/*
Test
false()
Usage
/ ubl:DespatchAdvice / cac:DespatchLine / cac:DocumentReference / cac:Attachment / cac:ExternalReference