Message

Value MUST be part of code list 'ISO 3166-1:Alpha2 Country codes'.

Context
/ubl:Waybill/cac:Shipment/cac:Consignment/cac:FinalDestinationCountry/cbc:IdentificationCode
Test
(some $code in $clISO3166 satisfies $code = normalize-space(text()))
Code lists
ISO 3166-1:Alpha2 Country codes
Usage
/ ubl:Waybill / cac:Shipment / cac:Consignment / cac:FinalDestinationCountry / cbc:IdentificationCode