45As regards the German Government's assertion that the establishment of a customs and agricultural union was expressly required by the Commission, it need merely be pointed out that the Commission may not, except where such powers are expressly conferred upon it, give guarantees concerning the compatibility of particular practices with Community law. In no circumstances does it have the power to authorise practices which are contrary to Community law (Case C-340/96 Commission v United Kingdom [1999] ECR I-2023, paragraph 31).
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