Order of the Court (Eighth Chamber) of 4 April 2019.#Proceedings brought by DP and Finanzamt Linz.#Request for a preliminary ruling from the Landesverwaltungsgericht Oberösterreich.#Reference for a preliminary ruling — Article 53(2) of the Rules of Procedure of the Court of Justice — Principles of EU law — Primacy — National rules requiring the lower courts to follow the interpretation of the higher courts — Restriction of the matters referred to the higher courts to the assessment of points of law and of the pleas raised before the lower courts.#Case C-545/18.