20That principle, which is part of the Community legal order (see the judgment in Joined Cases 205/82 to 215/82 Deutsche Milchkontor and Others v Germany [1983] ECR 2633, paragraph 30), is the corollary of the principle of legal certainty, which requires that legal rules be clear and precise, and aims to ensure that situations and legal relationships governed by Community law remain foreseeable. It is settled case-law that in the sphere of the common organization of the markets, whose purpose involves constant adjustments to meet changes in the economic situation, economic agents cannot legitimately expect that they will not be subject to restrictions arising out of future rules of market or structural policy (see, in particular, the judgment in Case C-177/90 Kühn v Landwirtschaftskammer Weser-Ems [1992] ECR I-35, paragraph 13). According to paragraph 14 of that judgment, the principle of the protection of legitimate expectations may be invoked as against Community rules only to the extent that the Community itself has previously created a situation which can give rise to a legitimate expectation.
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