Validation rules

BR-Z-02

The invoice has zero-rated (Z) lines, which require the seller VAT identifier (BT-31) or tax registration number (BT-32).

Rule: BR-Z-02 — official EN 16931 / XRechnung rule
Severity: error
Business term: BT-31 — Seller VAT identifier
Field in your JSON: invoice.seller.vat_id
Detected by: tier 3 — KoSIT validator (authoritative)
Reachability: Triggerable from your request JSON (generate & validate)

How to fix it

Set invoice.seller.vat_id (e.g. "DE123456789") or invoice.seller.tax_number.

BR-Z-02 auf Deutsch — was bedeutet der Fehler?

Die Rechnung enthält Nullsatz-Positionen (Kategorie Z); dafür ist die USt-IdNr. (BT-31) oder Steuernummer (BT-32) des Verkäufers Pflicht.

So beheben Sie den Fehler

Setzen Sie invoice.seller.vat_id (z. B. "DE123456789") oder invoice.seller.tax_number.

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.