# BR-05 — Currency code missing

> https://billhorse.com/en/rules/br-05/

## What does this error mean?

The invoice currency (BT-5, ISO 4217) is mandatory.

## How to fix it

UBL: <cbc:DocumentCurrencyCode>EUR</…>. CII: ram:InvoiceCurrencyCode in ApplicableHeaderTradeSettlement.