Validation rules

BR-56 — EN 16931 rule

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.

Related rules

BR-55 — A preceding-invoice reference (BG-3) is present but the preceding invoice number (BT-25) is missing.
BR-57 — A deliver-to address (BG-15) must contain a country code (BT-80).
BR-54 — An item attribute (BG-32) must carry both a name (BT-160) and a value (BT-161).
BR-53 — A VAT accounting currency (BT-6) is given, so the VAT total in that currency (BT-111) must be present as well.
BR-52 — An additional supporting document (BG-24) has no document reference (BT-122).
BR-51 — A card payment must never carry the full primary account number (BT-87) — at most the first 6 and last 4…

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.