Validation rules
UBL-SR-49
The tax point date code (BT-8) appears more than once — only one cac:InvoicePeriod/cbc:DescriptionCode is allowed.
- Rule
UBL-SR-49— official EN 16931 / XRechnung rule- Severity
- error
- Detected by
- tier 3 — KoSIT validator (authoritative)
- Reachability
- Only reachable when validating your own XML — normbill-generated documents cannot trigger it
The normbill invoice model has no tax point date code; generated XML never contains cac:InvoicePeriod.
How to fix it
Keep a single DescriptionCode inside the document-level InvoicePeriod.
UBL-SR-49 auf Deutsch — was bedeutet der Fehler?
Der KoSIT-Validator lehnt die Rechnung ab, weil der Code des Steuer-Stichtags (BT-8) mehrfach vorkommt — nur ein cac:InvoicePeriod/cbc:DescriptionCode ist erlaubt.
So beheben Sie den Fehler
Behalten Sie genau einen DescriptionCode in der dokumentweiten InvoicePeriod.
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.