Order of the Court (Sixth Chamber) of 23 September 2021.#IO v Wallonische Region.#Request for a preliminary ruling from the Gericht Erster Instanz Eupen.#Reference for a preliminary ruling – Article 99 of the Rules of Procedure of the Court of Justice – Article 49 TFEU – Freedom of establishment – Road traffic – Driver residing in one Member State – Vehicle registered in another Member State – Vehicle made available to the partner and manager of an undertaking established in that other Member State – Registration obligation in the first Member State.#Case C-23/21.