BR-CO-13: Total amount without VAT mismatch
Severity: error
What it means
Invoice total amount without VAT (BT-109) does not equal the sum of Invoice line net amounts (BT-131) minus document-level allowances (BT-107) plus document-level charges (BT-108).
Most common cause
Often cascades from a BR-CO-10 line-sum mismatch; can also come from TaxExclusiveAmount being edited without recalculating it from the lines, charges and allowances.
How to fix it
Recompute TaxExclusiveAmount from LineExtensionAmount, ChargeTotalAmount and AllowanceTotalAmount at the source and re-issue. Not auto-repaired: arithmetic mismatch, reported expected-vs-found only.