fatalEN 16931syntax binding ruleUBL
Despatch advice identifier shall occur maximum once
'Despatch advice identifier' appears more than once, and this profile allows it at most once.
Keep the single correct 'Despatch advice identifier' and delete the rest. Repeating an element that the semantic model treats as singular is usually a serialiser writing every value it has instead of choosing one.
UBL — context /ubl:Invoice | /cn:CreditNote
(count(cac:DespatchDocumentReference/cbc:ID) <= 1)