# BR-DE-15 — Buyer reference/Leitweg-ID missing (XRechnung)

> https://billhorse.com/en/rules/br-de-15/

## What does this error mean?

XRechnung requires the buyer reference (BT-10). For invoices to German public bodies this is the Leitweg-ID.

## How to fix it

UBL: populate <cbc:BuyerReference>. Public buyers provide their Leitweg-ID; for B2B any buyer reference is acceptable.