BR-CO-13 error
What this rule checks
Explanation
The Invoice total amount without VAT (BT-109) must equal the line-net-amount total already checked by BR-CO-10 (BT-106), minus the document-level allowance total from BR-CO-11 (BT-107), plus the document-level charge total from BR-CO-12 (BT-108). This rule sits one level up from BR-CO-10/11/12 — it doesn't recompute those component sums, it checks they combine correctly into this one figure.
How to fix it
Recompute BT-109 as BT-106 minus BT-107 plus BT-108, using the exact figures already used to satisfy BR-CO-10/11/12. If those three are individually correct but BR-CO-13 still fails, the combination arithmetic itself (not a component sum) is the problem.
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