# XV-AT-01

Source: https://xmlvalid.com/rules/XV-AT-01

> The line's order reference InvoiceRecipientsOrderReference/OrderID (…) differs from the invoice's OrderID (…); e-Rechnung.gv.at does not accept an invoice for more than one order.

- Level: error
- Rule sets: e-Rechnung.gv.at checks (ebInterface) Fehlerliste, October 2026
- Context: `/*:Invoice/*:Details/*:ItemList/*:ListLineItem`
- Test: `not(*:InvoiceRecipientsOrderReference/*:OrderID) or $order = '' or normalize-space(*:InvoiceRecipientsOrderReference/*:OrderID) = $order`

Validate a document against these rules: https://xmlvalid.com/validate