BR-CO-13: The invoice total without VAT (BT-109) does not equal line net amounts (BT-131)…
What it means
The invoice total without VAT (BT-109) does not equal line net amounts (BT-131) minus document-level allowances (BT-107) plus document-level charges (BT-108).
How to fix it
Recompute BT-109 from the lines, allowances and charges at the source and re-issue. Arithmetic mismatch -- reported, never auto-repaired.