15It follows from Articles 2 and 10 of the Act of Accession that it is based on the principle that the provisions of Community law apply ab initio and in toto to new Member States, derogations being allowed only in so far as they are expressly laid down by transitional provisions (see, mutatis mutandis, Case 258/81 Metallurgiki Halyps v Commission [1982] ECR 4261, paragraph 8).
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