BR-12: An Invoice shall have the Sum of Invoice line net amount

StandardEN 16931-1 (European e-invoicing semantic model)SeverityError: the invoice is rejectedSyntaxUBL, CIIBusiness terms

BT-106 Sum of Invoice line net amount

Applies toEvery EN 16931 invoice: XRechnung, ZUGFeRD 2.x / Factur-X (profiles EN 16931, EXTENDED, XRECHNUNG), Peppol BIS Billing 3.0, and national CIUS such as the Dutch NLCIUS or the Italian/Spanish profiles.

Official rule text

[BR-12] An Invoice shall have the Sum of Invoice line net amount (BT-106).

Why this error occurs

This is an arithmetic consistency rule: the validator recomputes the amount from its components and compares it with the value in the file. It fails when the totals were computed with different rounding, when line amounts were changed after the totals were written, or when allowances/charges are counted twice.

How to fix it

Recalculate exactly as the formula in the rule text says, round each component to 2 decimals first and then sum (not the other way round), and write the result into the element. Make sure allowances are subtracted and charges added only once, and that prepaid and rounding amounts are included where the formula lists them.

What the validator checks

Checked element (context):

UBL

cac:LegalMonetaryTotal

Test (XPath):

exists(cbc:LineExtensionAmount)

CII

//ram:SpecifiedTradeSettlementHeaderMonetarySummation

Test (XPath):

(ram:LineTotalAmount)

Check your invoice

Drop your XML or PDF on the validator and every failed rule is linked to its page here. Free, no account, the file is not stored.

Check your invoice →

Same check via API:

curl -F file=@invoice.xml https://einvoicechecker.com/v1/validate

Related rules

BR-CO-10 Sum of line net amounts (BT-106) does not match the lines
BR-DEC-09 The allowed maximum number of decimals for the Sum of Invoice line net amount is 2
BR-01 Specification identifier (BT-24) is missing
BR-02 Invoice number (BT-1) is missing
BR-03 Invoice issue date (BT-2) is missing
BR-04 Invoice type code (BT-3) is missing
BR-05 Invoice currency code (BT-5) is missing
BR-06 Seller name (BT-27) is missing

Frequently asked questions

What does BR-12 mean?

BR-12 is a en 16931 core rule: An Invoice shall have the Sum of Invoice line net amount (BT-106).

Will my invoice be rejected because of BR-12?

Yes. BR-12 is flagged "fatal"; validators (KoSIT, Peppol access points, the German ZRE/OZG-RE portals) reject the invoice until it is fixed.

Which formats does BR-12 apply to?

Every EN 16931 invoice: XRechnung, ZUGFeRD 2.x / Factur-X (profiles EN 16931, EXTENDED, XRECHNUNG), Peppol BIS Billing 3.0, and national CIUS such as the Dutch NLCIUS or the Italian/Spanish profiles. Syntax: UBL and CII.

Source: EN 16931-1:2017 schematron (CEN TC434, via Peppol BIS 3.0.20). Catalogue generated from the official schematron on 2026-10-14.