`BR-55`

EN 16931 · validation rule

EN 16931Error

A preceding invoice reference (BG-3) has no invoice number (BT-25). The sender must fill cac:BillingReference/cac:InvoiceDocumentReference/cbc:ID / ram:InvoiceReferencedDocument/ram:IssuerAssignedID.

Field: document.preceding_invoices[].id (BT-25)
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-55?lang=en