F-INV333
Only use Delivery.DeliveryParty if not specified on header level (Invoice.Delivery)
error: the document is invalid
What the rule checks
As the rule set's publisher wrote it. The rule runs on every element the context matches, and fails where the test is false; the validator reports the line of that element.
Context
doc:Invoice/cac:InvoiceLine
Test
cac:Delivery/cac:DeliveryParty and count(../cac:Delivery/cac:DeliveryParty)
Checked with Denmark OIOUBL 2.1 Invoice