Validation rules

cvc-attribute.3 — EN 16931 rule

An attribute value does not match the attribute's declared datatype — e.g. a non-numeric value where the schema expects a number, or a malformed code.

Rule
cvc-attribute.3 — official EN 16931 / XRechnung rule
Severity
error
Detected by
tier 2 — XML schema (XSD)
Reachability
Only reachable when validating your own XML — normbill-generated documents cannot trigger it

normbill's serializer emits schema-valid XML by construction; this can only fire for XML submitted to /v1/invoices/validate.

How to fix it

Correct the attribute value on the element the finding points at; the validator message names the attribute and the expected type.

cvc-attribute.3 auf Deutsch — was bedeutet der Fehler?

Der KoSIT-Validator lehnt das Dokument bereits bei der XML-Schema-Prüfung (XSD) ab: Ein Attributwert entspricht nicht dem deklarierten Datentyp — z. B. ein nicht-numerischer Wert, wo das Schema eine Zahl erwartet.

So beheben Sie den Fehler

Korrigieren Sie den Attributwert am beanstandeten Element; die Validator-Meldung nennt Attribut und erwarteten Typ.

Official sources

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.

Spotted something?

Bug, missing feature, wrong validation result — tell us. The page you're on is attached automatically; email optional.