BR-04: The invoice has no invoice type code (BT-3), the code that says whether it is a…
What it means
The invoice has no invoice type code (BT-3), the code that says whether it is a commercial invoice, credit note, etc.
How to fix it
Set BT-3 to the correct UNTDID 1001 code for this document (e.g. 380 for a commercial invoice).