Judgment of the Court (Ninth Chamber) of 27 October 2022.#ID v Stadt Mainz.#Reference for a preliminary ruling – Freedom to provide services – Directive 2006/123/EC – Article 15(1), (2)(g) and (3) – Services in the internal market – Fees of architects and engineers – Fixed minimum tariffs – Direct effect of provisions of EU law and possible inapplicability of national legislation.#Case C-544/21.