Opinion of Advocate General Hogan delivered on 10 April 2019.#Grup Servicii Petroliere SA v Agenţia Naţională de Administrare Fiscală – Direcţia Generală de Soluţionare a Contestaţiilor and Agenţia Naţională de Administrare Fiscală - Direcţia Generală de Administrare a Marilor Contribuabili.#Request for a preliminary ruling from the Curtea de Apel Bucureşti.#Reference for a preliminary ruling — Common system of value added tax (VAT) — Directive 2006/112/EC — Article 148(a) and (c) — Exemptions related to international transport — Supply of offshore jackup drilling rigs — Concept of ‘vessels used for navigation on the high seas’