Validation rules
UBL-SR-49 — UBL rule
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.
Related rules
UBL-SR-48— An invoice line does not have exactly one cac:ClassifiedTaxCategory — every line states its VAT category…UBL-SR-50— An item carries more than one description (BT-154) — only one cbc:Description per cac:Item is allowed.UBL-SR-47— Several cac:PaymentMeans elements carry different cbc:PaymentMeansCode values — when the code (BT-81) is…UBL-SR-51— An address carries more than one cac:AddressLine — only one additional address line (line 3) is allowed per…UBL-SR-46— The payment means text (BT-82, the name attribute on cbc:PaymentMeansCode) appears more than once in the…UBL-SR-52— An invoice line carries more than one cac:DocumentReference — the line-level invoiced-object identifier…
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.