37With regard to the first part of the first question, relating to the scope of the system of common prices instituted by Regulation No 804/68, it should be observed at the outset, as the Advocate General noted in point 32 of her Opinion, that it is settled case-law that, where there is a regulation on the common organisation of the markets in a given sector, the Member States are under an obligation to refrain from taking any measures which might undermine or create exceptions to it. Rules which interfere with the proper functioning of a common organisation of the markets are also incompatible with such common organisation, even if the matter in question has not been exhaustively regulated by it (see, inter alia, Case C-l/96 Compassion in World Farming [1998] ECR I-1251, paragraph 41, and the case-law there cited).
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