Message

Value MUST be part of code list 'ISO 6523 International Code Designator (ICD)'.

Context
/ubl:Catalogue/cac:ProviderParty/cbc:EndpointID
Test
not(@schemeID) or (some $code in $clICD satisfies $code = @schemeID)
Code lists
ISO 6523 International Code Designator (ICD)
Usage
/ ubl:Catalogue / cac:ProviderParty / cbc:EndpointID / @schemeID