Message

Value MUST be part of code list 'Boolean indicator (openPEPPOL)'.

Context
/ubl:Order/cac:OrderLine/cac:LineItem/cbc:PartialDeliveryIndicator
Test
(some $code in $clTrueFalse satisfies $code = normalize-space(text()))
Code lists
Boolean indicator (openPEPPOL)
Usage
/ ubl:Order / cac:OrderLine / cac:LineItem / cbc:PartialDeliveryIndicator