F-CRN082
One Item class must be present when CreditNoteLine/BillingReference is not specified
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:CreditNote/cac:CreditNoteLine
Test
not(count(cac:Item)) and not(count(cac:BillingReference))
Checked with Denmark OIOUBL 2.1 Credit Note