BR-CO-11:Line amount calculation error
Line net amount must equal quantity × price, adjusted for any line allowances/charges.
Engine Classification
Financial or legal field · Modification blocked by policy
Reason: Line amount calculations (quantity x price) must match your order/delivery documents. Discrepancies may indicate pricing or quantity errors.
What is BR-CO-11?
BR-CO-11 is a fatal validation rule defined in the EN 16931 specification. It validates the LineExtensionAmount element under Invoice > InvoiceLine 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: XPath: /Invoice/cac:InvoiceLine/cbc:LineExtensionAmount
Why This Error Matters
Invoice rejected. Calculation errors prevent proper total verification.
BR-CO-11 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.
Validator Behavior
- ·Causes invoice rejection
- ·Error returned: BR-CO-11
- ·Specification: EN 16931
How to Fix It
Get base amount
Quantity × PriceAmount
Apply allowances
Subtract line-level AllowanceCharge where ChargeIndicator=false
Apply charges
Add line-level AllowanceCharge where ChargeIndicator=true
Set LineExtensionAmount
Result should match exactly (watch rounding)
Before / After
<cac:AllowanceCharge[ChargeIndicator=false]> <cbc:Amount>999.99</cbc:Amount> <!-- Does not match expected calculation --> </cac:AllowanceCharge[ChargeIndicator=false]>
<cac:AllowanceCharge[ChargeIndicator=false]> <cbc:Amount>100.00</cbc:Amount> <!-- Matches expected calculation --> </cac:AllowanceCharge[ChargeIndicator=false]>
Technical Reference
XPath: /Invoice/cac:InvoiceLine/cbc:LineExtensionAmountCode Example
<cac:InvoiceLine>
<cbc:InvoicedQuantity unitCode="C62">10</cbc:InvoicedQuantity>
<cbc:LineExtensionAmount currencyID="EUR">90.00</cbc:LineExtensionAmount>
<cac:AllowanceCharge>
<cbc:ChargeIndicator>false</cbc:ChargeIndicator>
<cbc:Amount currencyID="EUR">10.00</cbc:Amount>
</cac:AllowanceCharge>
<cac:Price>
<cbc:PriceAmount currencyID="EUR">10.00</cbc:PriceAmount>
</cac:Price>
<!-- 10 × 10.00 - 10.00 = 90.00 ✓ -->
</cac:InvoiceLine>Common Causes
- ·Sum of document allowances does not match BT-107
- ·AllowanceTotalAmount calculation mismatch
- ·Individual allowance amounts don't sum to total
- ·Allowance added/removed without updating total
- ·Rounding error in allowance sum calculation
Seeing this in production? The API handles BR-CO-11 automatically. See the fix response →
Commonly Seen In
Frequently Asked Questions
Line net amount must equal quantity × price, adjusted for any line allowances/charges.
Recalculate the value in `cbc:Amount` to match the expected formula. Verify all contributing amounts are correct. This error involves a protected field — Invoice Navigator flags it in your pipeline so your team can correct it at the source.
Yes, BR-CO-11 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.
BR-CO-11 involves a financial or legal field that cannot be auto-modified by policy. Invoice Navigator detects and flags this error immediately, but the correction must be made manually in your ERP or invoicing software.
BR-CO-11 is commonly seen in exports from All invoicing software. These software packages sometimes generate invoices that need adjustment to meet full compliance standards.
Related Content
Last updated: 3 March 2026
Detect BR-CO-11 Before Submission
This error involves a financial or legal field that cannot be auto-modified. The compliance engine flags it immediately with a clear diagnosis so your team can fix it at the source.