BR-02: The invoice number is missing
This code shows up when an electronic invoice is validated. Here is what it means, why it fires, and what to change in the file.
Why this code appears
No invoice number (BT-1). It identifies the document in both parties' accounts, and it is the key used to reconcile a payment.
How to fix it
Fill ExchangedDocument/ID with the invoice number: the same one printed on the page.
Where it happens
This code comes from EN 16931, the European e-invoicing standard. It concerns business term BT-1.