Validation rules

BR-DE-16 — XRechnung rule

A seller VAT identifier (BT-31), tax registration number (BT-32) or seller tax representative (BG-11) is required as soon as the invoice uses VAT category S, Z, E, AE, K, G, L or M.

Rule: BR-DE-16 — official EN 16931 / XRechnung rule
Severity: error
Business term: BT-31 — Seller VAT identifier
Field in your JSON: invoice.seller.vat_id

How to fix it

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

BR-DE-16 auf Deutsch — was bedeutet der Fehler?

Es fehlt die Umsatzsteuer-Identifikationsnummer (BT-31) oder die Steuernummer (BT-32) des Verkäufers. Sobald die Rechnung eine der Umsatzsteuerkategorien S, Z, E, AE, K, G, L oder M verwendet, ist eine der beiden Pflicht — alternativ ein Steuervertreter des Verkäufers (BG-11).

So beheben Sie den Fehler

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

Dieselbe Regel, gemappt auf Ihr JSON, kommt von der XRechnung API.

Related rules

BR-S-02 — The invoice has standard-rated (S) lines, which require the seller VAT identifier (BT-31), the tax…
BR-CO-26 — The seller carries none of: VAT identifier (BT-31), legal registration identifier (BT-30) or seller…
BR-CO-09 — A VAT identifier (seller BT-31, buyer BT-48, or tax representative BT-63) does not start with an ISO 3166-1…
BR-AF-02 — The invoice has IGIC (L) lines, which require the seller VAT identifier (BT-31), the tax registration number…
BR-AF-03 — A document-level allowance uses VAT category L (IGIC), which requires the seller VAT identifier (BT-31), the…
BR-AF-04 — A document-level charge uses VAT category L (IGIC), which requires the seller VAT identifier (BT-31), the…

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.

Generate a valid XRechnung from JSON with the XRechnung API — the 422 names this field instead of the Schematron code.