Validation rules
UBL-SR-48
An invoice line does not have exactly one cac:ClassifiedTaxCategory — every line states its VAT category (BT-151) exactly once.
- Rule
UBL-SR-48— official EN 16931 / XRechnung rule- Severity
- error
- Business term
BT-151— Line VAT category- Field in your JSON
invoice.lines[*].vat_category- Detected by
- tier 3 — KoSIT validator (authoritative)
- Reachability
- Only reachable when validating your own XML — normbill-generated documents cannot trigger it
The serializer always emits exactly one ClassifiedTaxCategory per line.
How to fix it
Keep exactly one ClassifiedTaxCategory inside cac:Item per line. Through normbill, set line.vat or line.vat_category.
UBL-SR-48 auf Deutsch — was bedeutet der Fehler?
Der KoSIT-Validator lehnt die Rechnung ab, weil eine Position nicht genau eine cac:ClassifiedTaxCategory trägt — jede Position nennt ihre Umsatzsteuer-Kategorie (BT-151) genau einmal.
So beheben Sie den Fehler
Behalten Sie genau eine ClassifiedTaxCategory in cac:Item je Position. Über normbill setzen Sie line.vat oder line.vat_category.
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.