Validation rules

BR-06 — EN 16931 rule

The seller name (BT-27) is missing or empty.

Rule: BR-06 — official EN 16931 / XRechnung rule
Severity: error
Business term: BT-27 — Seller name
Field in your JSON: invoice.seller.name
Detected by: tier 3 — KoSIT validator (authoritative)
Reachability: Only reachable when validating your own XML — normbill-generated documents cannot trigger it

The request schema requires invoice.seller.name, so generated documents always carry BT-27.

How to fix it

Provide cac:PartyLegalEntity/cbc:RegistrationName on the supplier party.

BR-06 auf Deutsch — was bedeutet der Fehler?

Der Name des Verkäufers (BT-27) fehlt oder ist leer.

So beheben Sie den Fehler

Hinterlegen Sie cac:PartyLegalEntity/cbc:RegistrationName bei der Verkäuferpartei.

Related rules

UBL-SR-09 — The seller name (BT-27) appears more than once — the supplier party may carry only one…
BR-05 — The invoice currency code (BT-5) is missing.
BR-07 — The buyer name (BT-44) is missing or empty.
BR-04 — The invoice type code (BT-3) is missing.
BR-08 — The seller postal address (BG-5) is missing.
BR-03 — The issue date (BT-2) 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.