Validation rules

BR-DE-23-A

BR-DE-23-A is an official EN 16931 / XRechnung rule checked by the KoSIT validator — the authoritative reference implementation normbill validates against.

We haven't written a curated explanation for this rule yet. The validation issue that pointed you here carries the official rule text; where possible the API also maps the finding back to the field in your request JSON.

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.

Hit this rule and the message wasn't enough? Email support@normbill.com with the rule id — curated explanations are added based on real traffic.