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Compliant e-invoices in one POST request. Generate, validate and parse XRechnung and ZUGFeRD / Factur-X. Made in Germany, hosted in the EU.

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© 2026 VIBOA UG (haftungsbeschränkt) · HannoverDE · EN

Not legal or tax advice. XRechnung® is a standard of KoSIT; ZUGFeRD® of FeRD. Names used for format identification only.

DocumentationAuthenticationYour first invoiceThe 422 reportQuotas & limitsTest vs. live keys
API referencePOST…/generatePOST…/validatePOST…/parse
ReferenceError codesValidation rulesInteractive referenceOpenAPI spec↗@normbill/xrechnung↗Status

Validation rules

PEPPOL-EN16931-R044

A charge on price level is not allowed — only allowances (indicator 'false').

Rule
PEPPOL-EN16931-R044 — 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 normbill invoice model has no price-level allowances or charges.

How to fix it

Express surcharges at line or document level, not inside the price.

PEPPOL-EN16931-R044 auf Deutsch — was bedeutet der Fehler?

Ein Zuschlag auf Preisebene ist nicht zulässig — nur Nachlässe (Indikator 'false').

So beheben Sie den Fehler

Drücken Sie Zuschläge auf Positions- oder Dokumentebene aus, nicht im Preis.

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.