71As for the compatibility of the 1997 decision and the 1997-1999 aid scheme with the principle of the protection of legitimate expectations, the Court has repeatedly held that the right to rely on that principle extends to any person in a situation where a European Union institution has caused him to entertain expectations which are justified. However, a person may not plead infringement of that principle unless he has been given precise assurances by that institution. Similarly, if a prudent and alert economic operator could have foreseen the adoption of a measure likely to affect his interests, he cannot plead that principle if the measure is adopted (see, to that effect, Belgium and Forum 187 v Commission, paragraph 147 and the case-law cited, and Case C-519/07 P Commission v Koninklijke FrieslandCampina [2009] ECR I-8495, paragraph 84).
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