CELEX:62021CC0247: Opinion of Advocate General Kokott delivered on 14 July 2022.#Luxury Trust Automobil GmbH v Finanzamt Österreich.#Request for a preliminary ruling from the Verwaltungsgerichtshof.#Reference for a preliminary ruling – Value added tax (VAT) – Directive 2006/112/EC – Article 42(a) – Article 197(1)(c) – Article 226(11a) – Article 141 – Exemption – Triangular transaction – Designation of the final recipient of a supply as being liable for VAT – Invoicing – Reference to ‘Reverse charge’ – Mandatory – Omission of that reference on an invoice – Retroactive correction of the invoice.#Case C-247/21.