BR-CO-13
A rule of the European standard EN 16931 – applies to every invoice following the standard, including Peppol BIS Billing 3.0.
What this error means
BR-CO-13
Invoice total without VAT (BT-109) must equal: sum of lines − document-level allowances + document-level charges.
How to fix it
Recalculate TaxExclusiveAmount from those three components; check that discounts and charges are included.