# BR-44 Invoice line charge reason or reason code is required

Each Invoice line charge (BG-28) shall have an Invoice line charge reason (BT-144) or an Invoice line charge reason code (BT-145).

## Problem Description

Each Invoice line charge (BG-28) shall have an Invoice line charge reason (BT-144) or an Invoice line charge reason code (BT-145).

> **ERROR**: XRechnung 3.0

## Context and Significance

This rule comes from the EN16931 core semantic model enforced by the KoSIT XRechnung 3.0.2 Schematron, ensuring invoices carry the mandatory data needed for automated processing.

## Solution

Add cbc:AllowanceChargeReason text or cbc:AllowanceChargeReasonCode (UNCL7161) to the line charge; if both are given they must describe the same reason.

- validate
- convert

## Valid Examples

- BT-144 = "Handling"
- BT-145 = ABK (miscellaneous)

## Invalid Examples

- Line charge with amount only, no reason or reason code

## Code Examples

### Valid XML
```
<cac:AllowanceCharge>
  <cbc:ChargeIndicator>true</cbc:ChargeIndicator>
  <cbc:AllowanceChargeReasonCode>ABK</cbc:AllowanceChargeReasonCode>
  <cbc:AllowanceChargeReason>Handling</cbc:AllowanceChargeReason>
  <cbc:Amount currencyID="EUR">1.50</cbc:Amount>
</cac:AllowanceCharge>
```

### Invalid XML
```
<cac:AllowanceCharge>
  <cbc:ChargeIndicator>true</cbc:ChargeIndicator>
  <cbc:Amount currencyID="EUR">1.50</cbc:Amount>
</cac:AllowanceCharge>
```

## Affected Fields

- [BT-144 Invoice line charge reason](/resources/xrechnung/bt-144-invoice-line-charge-reason)
- [BT-145 Invoice line charge reason code](/resources/xrechnung/bt-145-invoice-line-charge-reason-code)

## Related Rules

- [BR-43](/resources/kosit-validator-errors/br-43-line-charge-amount-required)
- [BR-CO-08](/resources/kosit-validator-errors/br-co-08-line-charge-reason-code-match)

## 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.