5By judgments of 28 April 1988 in Case 120/86 Mulder v Minister van Landbouw en Visserij [1988] ECR 2321 {‘Mulder I’) and Case 170/86 Von Deetzen v Hauptzollamt Hamburg-jonas [1988] ECR 2355 the Court of Justice declared Regulation No 857/84, as supplemented by Commission Regulation (EEC) No 1371/84 of 16 May 1984 laying down detailed rules for the application of the additional levy referred to in Article 5c of Regulation (EEC) No 804/68 (OJ 1984 L 132, p. 11), invalid on the ground that it infringed the principle of protection of legitimate expectations.
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