Rules/EN 16931/Error
BR-02
Peppol BIS Billing 3.0.21An Invoice shall have an Invoice number (BT-1).
In plain English
Every invoice needs its own invoice number (BT-1), and it is missing.
How to fix it
Set cbc:ID to the invoice number.
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.