F-INV142
Invoice/OrderReference is mandatory when OrderLineReference class is present
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:OrderLineReference and not(count(../cac:OrderReference))
Checked with Denmark OIOUBL 2.1 Invoice