Message

Element 'cbc:CustomizationID' MUST contain value 'urn:fdc:peppol.eu:poacc:trns:order_cancellation:3'.

Context
/ubl:OrderCancellation/cbc:CustomizationID
Test
normalize-space(text()) = 'urn:fdc:peppol.eu:poacc:trns:order_cancellation:3'
Usage
/ ubl:OrderCancellation / cbc:CustomizationID