Validation rules

PEPPOL-EN16931-R121 — Peppol BIS rule

An item price base quantity must be a positive number above zero.

Rule: PEPPOL-EN16931-R121 — official EN 16931 / XRechnung rule
Severity: error
Detected by: tier 3 — KoSIT validator (authoritative)
Reachability: Not expressible through the normbill invoice model — documented for completeness

The request schema requires price_base_qty > 0 whenever it is set.

How to fix it

Use a positive cbc:BaseQuantity, or omit it (it defaults to 1).

PEPPOL-EN16931-R121 auf Deutsch — was bedeutet der Fehler?

Eine Preis-Basismenge muss eine positive Zahl größer null sein.

So beheben Sie den Fehler

Verwenden Sie eine positive price_base_qty (BT-149) — oder lassen Sie sie weg (Standard ist 1).

Related rules

PEPPOL-EN16931-R120 — An invoice line net amount must equal quantity × (price / base quantity) plus line charges minus line…
PEPPOL-EN16931-R130 — The unit code of an item price base quantity must equal the invoiced quantity's unit code.
PEPPOL-EN16931-R111 — An invoice line period end date must lie within the document invoicing period.
PEPPOL-EN16931-R110 — An invoice line period start date must lie within the document invoicing period.
PEPPOL-EN16931-R101 — A line document reference may only be used for an invoice line object identifier.
PEPPOL-EN16931-R061 — A direct-debit payment (means code 49/59) must carry a mandate reference (BT-89).

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.