Validation rules

BR-15 — EN 16931 rule

The amount due for payment (BT-115) is missing from the document totals.

Rule

BR-15 — official EN 16931 / XRechnung rule

Severity

error

Business term

BT-115 — Amount due (computed: BT-112 − BT-113)

Field in your JSON

invoice.totals.gross

Detected by

tier 3 — KoSIT validator (authoritative)

Reachability

Only reachable when validating your own XML — normbill-generated documents cannot trigger it

The serializer always writes BT-115. The UBL schema makes cbc:PayableAmount mandatory anyway, so the XSD tier reports hand-built XML without it first.

How to fix it

Add cbc:PayableAmount to cac:LegalMonetaryTotal.

Related rules

• BR-CO-16 — The amount due (BT-115) must equal the invoice total with VAT (BT-112) minus the paid amount (BT-113), plus…
• BR-DEC-18 — The amount due for payment (BT-115) uses more than 2 decimal places — EN 16931 allows at most 2.
• BR-14 — The invoice total with VAT (BT-112) is missing from the document totals.
• BR-16 — The invoice has no invoice lines (BG-25) — at least one is required.
• BR-13 — The invoice total without VAT (BT-109) is missing from the document totals.
• BR-17 — A payee (BG-10) that differs from the seller must state the payee name (BT-59).

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.

Or try it live: drop any XRechnung XML on the free validator — same KoSIT-backed report, no account.