Message

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

Context
/ubl:Catalogue/cac:CatalogueLine/cac:RequiredItemLocationQuantity/cac:ApplicableTerritoryAddress/cac:Country/cbc:IdentificationCode
Test
(some $code in $clISO3166 satisfies $code = normalize-space(text()))
Code lists
ISO 3166-1:Alpha2 Country codes
Usage
/ ubl:Catalogue / cac:CatalogueLine / cac:RequiredItemLocationQuantity / cac:ApplicableTerritoryAddress / cac:Country / cbc:IdentificationCode