55Niemann relies on the case-law concerning the principle of the protection of legitimate expectations (Case 1/73 Westzucker [1973] ECR 723, Case 74/74 CNTA v Commission [1975] ECR 533, Case 97/76 Merkur v Commission [1977] ECR 1063, Case 84/78 Tomadini [1979] ECR 1801, and Case C-368/89 Crispoltoni [1991] ECR I-3695, paragraph 21) in order to claim that the abolition from 1 January 2000 of aid for skimmed milk in liquid form intended for use as animal feed by a regulation adopted by the Commission on 17 December 1999 and published in the Official Journal of the European Communities of 31 December 1999 infringes the rights which it derives from that principle. It is no longer possible to fulfil contracts concluded prior to 31 December 1999 and the planning for 2000 had been completed long before that date. Such a fundamental change in the market, entailing significant effects for those concerned, cannot enter into force ‘from one day to the next’ but must be implemented following a sufficient transitional period.
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