30It must be recalled that the principles of legal certainty and protection of legitimate expectations form part of the EU legal order and, as such, must be observed not only by the EU institutions but also by Member States in the exercise of the powers conferred on them by EU rules (see, to that effect, inter alia, judgments in Netto Supermarkt, C‑271/06, EU:C:2008:105, paragraph 18, and Plantanol, C‑201/08, EU:C:2009:539, paragraph 43).
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