Message

Value MUST be part of code list 'Recommendation 20, including Recommendation 21 codes - prefixed with X (UN/ECE)'.

Context
/ubl:Catalogue/cac:CatalogueLine/cbc:OrderableUnit
Test
(some $code in $clUNECERec20 satisfies $code = normalize-space(text()))
Code lists
Recommendation 20, including Recommendation 21 codes - prefixed with X (UN/ECE)
Usage
/ ubl:Catalogue / cac:CatalogueLine / cbc:OrderableUnit