`BR-23`

EN 16931 · validation rule

EN 16931Error

An invoice line quantity has no unit of measure (BT-130). The sender must set the unitCode attribute on cbc:InvoicedQuantity / ram:BilledQuantity, e.g. C62 (piece), HUR (hour), KGM (kilogram) from UN/ECE Rec 20.

Field: lines[].unit (BT-130)
Rule set: EN 16931
Rule-set version: EN 16931 validation artefacts 1.3.17 · in force since 2026-10-13 · Rule-set changelog
Who has to fix it: The sender

This is a property of the file you received, so it cannot be corrected on your side without changing the document — ask the supplier to reissue it.

Check your own invoice

Drop the file that failed. We parse it, run the official rule sets against it and list every finding with a fix — 20 invoices per day, no key, nothing stored.

Open the live demo

Same explanation over the API: GET /v1/rules/BR-23?lang=en