241In that regard, as the Advocate General observed in points 40 and 45 of his Opinion, a regulation such as the contested regulation, which contains financial rules determining the procedure to be adopted for establishing and implementing the Union budget, within the meaning of Article 322(1)(a) TFEU, falls within the exercise of a competence of the European Union relating to its functioning, which, by its nature, can be exercised only by the Union itself. Therefore, the principle of subsidiarity cannot apply.
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