Validation rules

BR-22 — EN 16931 rule

An invoice line has no invoiced quantity (BT-129).

Rule: BR-22 — official EN 16931 / XRechnung rule
Severity: error
Business term: BT-129 — Invoiced quantity
Field in your JSON: invoice.lines[*].qty
Detected by: tier 3 — KoSIT validator (authoritative)
Reachability: Only reachable when validating your own XML — normbill-generated documents cannot trigger it

The request schema requires line.qty on every line.

How to fix it

Add cbc:InvoicedQuantity to the line.

BR-22 auf Deutsch — was bedeutet der Fehler?

Eine Rechnungsposition hat keine abgerechnete Menge (BT-129).

So beheben Sie den Fehler

Ergänzen Sie cbc:InvoicedQuantity in der Position.

Related rules

BR-21 — An invoice line has no line identifier (BT-126).
BR-23 — An invoiced quantity has no unit of measure code (BT-130).
BR-20 — The tax representative's postal address must contain a country code (BT-69).
BR-24 — An invoice line has no line net amount (BT-131).
BR-19 — A seller tax representative (BG-11) must carry a postal address (BG-12).
BR-25 — An invoice line has no item name (BT-153).

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.