59However, in assessing whether a regulatory act entails implementing measures, reference should be made exclusively to the subject matter of the action (judgments of 19 December 2013, Telefónica v Commission, C‑274/12 P, EU:C:2013:852, paragraph 31, and of 6 November 2018, Montessori, C‑622/16 P to C‑624/16 P, EU:C:2018:873, paragraph 61). Furthermore, where an applicant seeks only the partial annulment of an act, it is solely any implementing measures which that part of the act may entail that must, as the case may be, be taken into consideration (judgment of 18 October 2018, Internacional de Productos Metálicos v Commission, C‑145/17 P, EU:C:2018:839, paragraph 53).