Validation rules

BR-36 — EN 16931 rule

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.

Related rules

BR-DEC-05 — A document-level charge amount (BT-99) has more than 2 decimal places.
BR-37 — A document-level charge needs a VAT category (BT-102); it cannot be inherited because the lines use more…
BR-38 — A document-level charge must state what it is for (BT-104/BT-105).
BR-33 — A document-level allowance must state why it is granted (BT-97/BT-98).
BR-32 — A document-level allowance needs a VAT category (BT-95); it cannot be inherited because the lines use more…
BR-31 — A document-level allowance (BG-20) has no allowance amount (BT-92).

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.