W-INV194
The attribute languageID should be used when more than one PriceChangeReason element is present
warning: reported, still valid
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/cac:Price/cbc:PriceChangeReason
Test
count(../cbc:PriceChangeReason) > 1 and not(./@languageID)
Checked with Denmark OIOUBL 2.1 Invoice