BR-DE-15

Explanation

XRechnung requires a buyer reference (BT-10) — a field traditional VAT law doesn't have, which is why it often causes confusion. The buyer's system uses this value to route the invoice to the right place on their side (department, purchase order, approval workflow). For public sector buyers, this is the Leitweg-ID.

How to fix

Ask the buyer for their reference. Public sector buyers will give you a Leitweg-ID. In B2B, any identifier the buyer uses works — an order, customer, or project number. If the buyer has no reference of their own, agree on a value together (e.g. your order number); don't use a random placeholder the buyer won't recognise.