125It is settled case-law that where Member States adopt, in that way, measures by which they implement EU law, they are required to respect the general principles of that law, which include the principle of legal certainty (see, to that effect, inter alia, Plantanol, C‑201/08, EU:C:2009:539, paragraph 43 and the case-law cited, and IBV & Cie, C‑195/12, EU:C:2013:598, paragraph 49).
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