Case C-689/18: Order of the Court (Sixth Chamber) of 7 March 2019 (request for a preliminary ruling from the Dioikitiko Protodikeio Patron — Greece) — XT v Elliniko Dimosio (Reference for a preliminary ruling — Article 99 of the Rules of Procedure of the Court of Justice — Internal taxation — Prohibition of discriminatory taxation — Luxury tax — Motor vehicles — Exemption from tax depending on the date on which the goods first entered into service in the taxing Member State — No account taken of the date on which the goods first entered into service in another Member State)