Validation rules

BR-29

The invoicing period end date (BT-74) must not be earlier than its start date (BT-73).

Rule: BR-29 — official EN 16931 / XRechnung rule
Severity: error
Business term: BT-74 — Invoicing period end date
Field in your JSON: invoice.invoicing_period.end_date

How to fix it

Correct invoice.invoicing_period so end_date is on or after start_date.

BR-29 auf Deutsch — was bedeutet der Fehler?

Das Enddatum des Abrechnungszeitraums (BT-74) liegt vor dessen Startdatum (BT-73).

So beheben Sie den Fehler

Korrigieren Sie invoice.invoicing_period: 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.