Element 'cbc:CustomizationID' MUST contain value 'urn:fdc:anskaffelser.no:2019:ehf:spec:adv-order-cancellation:3.0'.
/ubl:OrderCancellation/cbc:CustomizationID
normalize-space(text()) = 'urn:fdc:anskaffelser.no:2019:ehf:spec:adv-order-cancellation:3.0'