Validation rules

BR-36

A document-level charge (BG-21) has no charge amount (BT-99).

Rule: BR-36 — official EN 16931 / XRechnung rule
Severity: error
Business term: BT-99
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 amount (or base_amount + percent) on every charge and the serializer always writes cbc:Amount; the UBL schema makes the element mandatory too, so the XSD tier reports hand-built XML without it first.

How to fix it

Add cbc:Amount to the charge.

BR-36 auf Deutsch — was bedeutet der Fehler?

Ein Zuschlag auf Dokumentebene (BG-21) hat keinen Zuschlagsbetrag (BT-99).

So beheben Sie den Fehler

Ergänzen Sie cbc:Amount im Zuschlag.

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.