[ibr-092]-If despatch advice reference exists on line (ibt-184) then there MUST not be despatch reference on document level (ibt-016).
ibr-092
cac:InvoiceLine/cac:DespatchLineReference/cac:DocumentReference/cbc:ID | cac:CreditNoteLine/cac:DespatchLineReference/cac:DocumentReference/cbc:ID
count(//cac:DespatchDocumentReference) = 0