45Where, as in the present case, a provision of EU law is ambiguous and hence open to several interpretations, preference must be given to the interpretation which ensures that the provision retains its effectiveness by interpreting it to that end in the light of the purposes of the legislation of which it forms part (see, to that effect, judgments of 19 June 1980, Roudolff, 803/79, EU:C:1980:166, paragraph 7, and of 24 February 2000, Commission v France, C‑434/97, EU:C:2000:98, paragraph 21).
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