BR-CO-10:Sum of Invoice line net amount (BT-106) = Σ Invoice line net amount (BT-131).
Each VAT category taxable amount must be correctly calculated from line amounts.
Engine Classification
Recalculate LineExtensionAmount as InvoicedQuantity x PriceAmount
Confidence: 90% · Applied automatically in pipeline
What is BR-CO-10?
BR-CO-10 is a fatal validation rule defined in the EN 16931 specification. It validates the LineExtensionAmount element in the UBL invoice XML.
When this rule fires, the invoice is non-compliant and will be rejected by Peppol access points and national validation services. The sending system receives a rejection response and the invoice does not reach the buyer.
Target path: //cac:InvoiceLine/cbc:LineExtensionAmount
Why This Error Matters
Invoice rejected. The receiver's system will detect the calculation mismatch during validation.
BR-CO-10 is a hard failure. Invoices that trigger this rule are rejected at the access point and never reach the recipient. In Peppol networks, this means your sending system receives an MLR (Message Level Response) with a rejection status. The invoice must be corrected and re-sent, adding delay to your payment cycle.
Invoice Navigator can automatically correct this error in your pipeline. The fix is applied with full audit evidence, so your compliance trail remains intact.
Validator Behavior
- ·Causes invoice rejection
- ·Error returned: BR-CO-10
- ·Specification: EN 16931
How to Fix It
Group lines
By TaxCategory ID and Percent
Sum line amounts
Add all LineExtensionAmount for group
Add doc charges
Include document-level charges/allowances for that category
Before / After
<cac:LegalMonetaryTotal> <cbc:LineExtensionAmount>999.99</cbc:LineExtensionAmount> <!-- Does not match expected calculation --> </cac:LegalMonetaryTotal>
<cac:LegalMonetaryTotal> <cbc:LineExtensionAmount>100.00</cbc:LineExtensionAmount> <!-- Matches expected calculation --> </cac:LegalMonetaryTotal>
Technical Reference
//cac:InvoiceLine/cbc:LineExtensionAmountCode Example
<cac:TaxSubtotal>
<cbc:TaxableAmount currencyID="EUR">850.00</cbc:TaxableAmount>
<cbc:TaxAmount currencyID="EUR">178.50</cbc:TaxAmount>
<cac:TaxCategory>
<cbc:ID>S</cbc:ID>
<cbc:Percent>21</cbc:Percent>
</cac:TaxCategory>
</cac:TaxSubtotal>Common Causes
- ·Sum of line net amounts does not match BT-106
- ·LineExtensionAmount total calculation mismatch
- ·Rounding errors accumulated across invoice lines
- ·Manual adjustment to total without updating lines
- ·Some lines excluded from sum calculation
Seeing this in production? The API handles BR-CO-10 automatically. See the fix response →
ERP-Specific Causes
Commonly Seen In
Frequently Asked Questions
Each VAT category taxable amount must be correctly calculated from line amounts.
Recalculate TaxableAmount for each tax category. You can also use Invoice Navigator's automatic Fixer tool to correct this instantly.
Yes, BR-CO-10 is a critical error that will cause invoice rejection. It must be fixed before submission to ensure your invoice is accepted by the recipient's system.
Many instances of BR-CO-10 can be automatically corrected using Invoice Navigator's Fixer tool. Upload your invoice and the tool will identify and fix common issues, including sum of vat category amounts incorrect.
BR-CO-10 is commonly seen in exports from All invoicing software. These software packages sometimes generate invoices that need adjustment to meet full compliance standards.
See Also
Related Errors
Last updated: 27 February 2026
Handle BR-CO-10 Automatically in Your Pipeline
The compliance engine auto-remediates this error with controlled safety policies and evidence pack generation.