Validation rules

BR-56

A seller tax representative (BG-11) must carry the representative's VAT identifier (BT-63).

Rule: BR-56 — official EN 16931 / XRechnung rule
Severity: error
Business term: BT-63
Detected by: tier 3 — KoSIT validator (authoritative)
Reachability: Not expressible through the normbill invoice model — documented for completeness

The normbill invoice model has no tax representative party (BG-11).

How to fix it

Add cac:PartyTaxScheme (scheme VAT) with cbc:CompanyID to the representative party.

BR-56 auf Deutsch — was bedeutet der Fehler?

Ein Steuervertreter des Verkäufers (BG-11) benötigt eine Umsatzsteuer-Identifikationsnummer (BT-63).

So beheben Sie den Fehler

Ergänzen Sie cac:PartyTaxScheme (Schema VAT) mit cbc:CompanyID bei der Vertreterpartei.

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.