# BR-24 Each invoice line must have a line net amount

Each invoice line (BG-25) must contain the invoice line net amount (BT-131).

## Problem Description

Each invoice line (BG-25) must contain the invoice line net amount (BT-131).

> **ERROR**: XRechnung 3.0

## Context and Significance

BT-131 is the source for BR-CO-10 and VAT breakdown reconciliation. Missing line nets often cascade into several total mismatch errors.

## Solution

Calculate BT-131 from quantity, unit price, and line-level allowances or charges, then round as required by the profile.

- validate
- convert

## Valid Examples

- BT-131 = 200.00 for 2 x 100.00

## Invalid Examples

- Line amount missing
- Line net set to 0.00 while quantity and price exist

## Technical Details

### Affected Fields
BT-131 Invoice line net amount

## Related Rules

- [BR-CO-10](/resources/kosit-validator-errors/br-co-10-sum-of-line-net-amounts-must-equal-line-total)
- [PEPPOL-EN16931-R120](/resources/kosit-validator-errors/peppol-en16931-r120-line-net-amount-formula)

## Validation Tools

- [Official KoSIT Validator](https://erechnungsvalidator.service-bw.de/): Validate your XRechnung files against all BR-DE rules.
- [Convert PDF to XRechnung](/pdf-to-xrechnung): Automatic validation error fixes when converting.

## Related Resources

- [Official Specification](https://xeinkauf.de/xrechnung/)
- [Test Suite](https://github.com/itplr-kosit/xrechnung-testsuite)
- [Complete Error List](/resources/kosit-validator-errors): Overview of all German XRechnung validation rules.