Validation rules

BR-05 — EN 16931 rule

The invoice currency code (BT-5) is missing.

Rule: BR-05 — official EN 16931 / XRechnung rule
Severity: error
Business term: BT-5 — Invoice currency
Field in your JSON: invoice.currency
Detected by: tier 3 — KoSIT validator (authoritative)
Reachability: Only reachable when validating your own XML — normbill-generated documents cannot trigger it

invoice.currency defaults to EUR in the request schema, so generated documents always carry BT-5.

How to fix it

Add cbc:DocumentCurrencyCode with an ISO 4217 code, e.g. EUR.

BR-05 auf Deutsch — was bedeutet der Fehler?

Der Währungscode der Rechnung (BT-5) fehlt.

So beheben Sie den Fehler

Ergänzen Sie cbc:DocumentCurrencyCode mit einem ISO-4217-Code, z. B. EUR.

Related rules

BR-CL-04 — The invoice currency code (BT-5) is not part of ISO 4217.
BR-CL-03 — An amount carries a currencyID attribute that is not an ISO 4217 currency code.
BR-04 — The invoice type code (BT-3) is missing.
BR-06 — The seller name (BT-27) is missing or empty.
BR-03 — The issue date (BT-2) is missing or empty.
BR-07 — The buyer name (BT-44) is missing or empty.

Official sources

Every 422 from the API lists the rule id, the path in your request JSON, a plain-language message and a suggested fix — see the docs overview for the report format.

Or try it live: drop any XRechnung XML on the free validator — same KoSIT-backed report, no account.