28He submits that, unlike recovery of a sum paid though not due arising pursuant to a provision solely of national legislation, which is a matter of purely national law, recovery of a sum paid though not due arising from application of Community provisions is a matter of Community law, because the Council, in the exercise of the powers which it holds under Article 42 EC, has the power to lay down detailed rules for the exercise of rights to social benefits which the persons concerned derive from the EC Treaty (Case 24/75 Petroni [1975] ECR 1149, paragraph 20).
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