Rules/EN 16931/Error
BR-05
Peppol BIS Billing 3.0.21An Invoice shall have an Invoice currency code (BT-5).
In plain English
The invoice does not say which currency it is in (BT-5).
How to fix it
Set cbc:DocumentCurrencyCode to an ISO 4217 code such as GBP.
Check a whole invoice against all 1,103 rules
This page explains one rule. einvoicing.dev checks a document against every one of them in a single request, and explains each finding the way this page does, with the fix. It isn't open yet: join the waitlist and you'll get a note when it is.
Check an invoice against every rule
One request returns each rule a document breaks, with this explanation and the fix.
All 1,103 rules
The full Peppol BIS Billing 3.0.21 rulebook, filterable.