Message

Value MUST be part of code list 'Transport service priority code (UNCL4219)'.

Context
/ubl:Order/cac:Delivery/cac:Shipment/cbc:ShippingPriorityLevelCode
Test
(some $code in $clUNCL4219 satisfies $code = normalize-space(text()))
Code lists
Transport service priority code (UNCL4219)
Usage
/ ubl:Order / cac:Delivery / cac:Shipment / cbc:ShippingPriorityLevelCode