Validation rules

BR-03

The issue date (BT-2) is missing or empty.

Rule: BR-03 — official EN 16931 / XRechnung rule
Severity: error
Business term: BT-2 — Issue date
Field in your JSON: invoice.issue_date
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.issue_date. Hand-built XML without a parseable date is already rejected by the XML schema (xs:date), so the XSD tier usually reports this first.

How to fix it

Set cbc:IssueDate to a calendar date in YYYY-MM-DD format.

BR-03 auf Deutsch — was bedeutet der Fehler?

Das Rechnungsdatum (BT-2) fehlt oder ist leer.

So beheben Sie den Fehler

Setzen Sie cbc:IssueDate auf ein Kalenderdatum im Format JJJJ-MM-TT.

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.