W-LIB222

The attribute languageID should be used when more than one Description 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.

Test
count(cbc:Description) > 1 and not(xs:int(count(cbc:Description) = xs:int(count(cbc:Description/@languageID))))

Checked with Denmark OIOUBL 2.1 Invoice