29In the exercise of the powers conferred on them by Article 131, the Member States must respect the general principles of law that form part of the legal order of the European Union, including, in particular, the principles of legal certainty and proportionality and the principle of protection of legitimate expectations (see, to that effect, Case C-271/06 Netto Supermarkt [2008] ECR I-771, paragraph 18; R, paragraph 45 and the case-law cited).
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