F-CRN016
One PaymentExchangeRate class must be present when PaymentCurrencyCode element is used
error: the document is invalid
What the rule checks
As the rule set's publisher wrote it. The rule runs on every element the context matches, and fails where the test is false; the validator reports the line of that element.
Context
doc:CreditNote/cbc:PaymentCurrencyCode
Test
count(/*/cac:PaymentExchangeRate) != 0
Checked with Denmark OIOUBL 2.1 Credit Note