# BR-CL-04 Invoice currency code must use ISO 4217 alpha-3

The invoice currency code (BT-5) must be a three-letter code from ISO 4217 alpha-3.

## Problem Description

The invoice currency code (BT-5) must be a three-letter code from ISO 4217 alpha-3.

> **ERROR**: XRechnung 3.0

## Context and Significance

This EN16931 core code-list rule fixes the currency in which the invoice totals are expressed.

## Solution

Set BT-5 to a valid ISO 4217 alpha-3 code such as EUR; do not use symbols, names or four-letter abbreviations.

- validate
- convert

## Valid Examples

- BT-5 = EUR
- BT-5 = CHF

## Invalid Examples

- BT-5 = EURO — not an ISO 4217 code
- BT-5 = Euro — currency name, not a code

## Code Examples

### Valid XML
```
<cbc:DocumentCurrencyCode>EUR</cbc:DocumentCurrencyCode>
```

### Invalid XML
```
<cbc:DocumentCurrencyCode>EURO</cbc:DocumentCurrencyCode>
```

## Affected Fields

- [BT-5 Invoice currency code](/resources/xrechnung/bt-5-invoice-currency-code)

## Related Rules

- [BR-CL-03](/resources/kosit-validator-errors/br-cl-03-iso-4217-currency-attribute)
- [BR-CL-05](/resources/kosit-validator-errors/br-cl-05-iso-4217-tax-currency)

## 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.