`BR-29`

EN 16931 · validation rule

EN 16931Error

The invoicing period end date (BT-74) is before its start date (BT-73). The sender must fix cac:InvoicePeriod/cbc:StartDate and cbc:EndDate / ram:BillingSpecifiedPeriod so that end >= start.

Field: document.period (BT-73/BT-74)
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-29?lang=en