Validation rules
BR-CO-20 — EN 16931 rule
An invoice line period (BG-26) is present but carries neither a start date (BT-134) nor an end date (BT-135).
- Rule
BR-CO-20— official EN 16931 / XRechnung rule- Severity
- error
- Detected by
- tier 3 — KoSIT validator (authoritative)
- Reachability
- Not expressible through the normbill invoice model — documented for completeness
The request schema rejects empty line periods via Zod refine.
How to fix it
Fill the line period's start_date and/or end_date, or omit period.
BR-CO-20 auf Deutsch — was bedeutet der Fehler?
Ein Positionszeitraum (BG-26) ist vorhanden, enthält aber weder Startdatum (BT-134) noch Enddatum (BT-135).
So beheben Sie den Fehler
Füllen Sie cbc:StartDate und/oder cbc:EndDate im Zeitraum der Position — oder entfernen Sie ihn.
Related rules
BR-CO-19— An invoicing period (BG-14) is present but carries neither a start date (BT-73) nor an end date (BT-74).BR-CO-21— A document-level allowance (BG-20) carries neither a reason text (BT-97) nor a reason code (BT-98) — at…BR-CO-18— The invoice has no VAT breakdown (BG-23) — at least one is required.BR-CO-22— A document-level charge (BG-21) carries neither a reason text (BT-104) nor a reason code (BT-105) — at least…BR-CO-17— A VAT breakdown's tax amount (BT-117) does not equal its taxable amount (BT-116) multiplied by the category…BR-CO-23— An invoice line allowance (BG-27) carries neither a reason text (BT-139) nor a reason code (BT-140) — at…
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.
Or try it live: drop any XRechnung XML on the free validator — same KoSIT-backed report, no account.