Validation rules

BR-30

An invoice line period end date (BT-135) must not be earlier than its start date (BT-134).

Rule: BR-30 — official EN 16931 / XRechnung rule
Severity: error
Business term: BT-135 — Invoice line period end date
Field in your JSON: invoice.lines[*].period.end_date

How to fix it

Correct the line period so end_date is on or after start_date.

BR-30 auf Deutsch — was bedeutet der Fehler?

Das Enddatum eines Positionszeitraums (BT-135) liegt vor dessen Startdatum (BT-134).

So beheben Sie den Fehler

Korrigieren Sie den Positionszeitraum: end_date muss auf oder nach start_date liegen.

Official sources

XRechnung specification (KoSIT / xeinkauf.de)
KoSIT validator on GitHub and the XRechnung validator configuration

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.