BR-CO-13
The invoice total without VAT (BT-109) must equal the sum of all line net amounts (BT-131) minus document-level allowances (BT-107) plus document-level charges (BT-108).
- Severity
- Error
- Applies to
- CII, UBL
- Rule set
- v2026-01-31
Official rule text
Invoice total amount without VAT (BT-109) = Σ Invoice line net amount (BT-131) - Sum of allowances on document level (BT-107) + Sum of charges on document level (BT-108).
Why it happens
Usually document-level allowances or charges are shown but forgotten when computing BT-109 — or the discount is already baked into the line prices and then subtracted a second time.
How to fix it
Compute BT-109 strictly as Σ BT-131 − BT-107 + BT-108 from exactly the values written in the document. A discount belongs either in the line or at document level — never in both.
NormAPI provides technical validation, not tax or legal advice.