46In that connection, attention should be drawn, at the outset, to the importance, both for the EU legal order and for the national legal systems, of the principle of res judicata. Indeed, the Court has already had occasion to observe that, in order to ensure stability of the law and legal relations, as well as the sound administration of justice, it is important that judicial decisions which have become definitive after all rights of appeal have been exhausted or after expiry of the time limits provided to exercise those rights can no longer be called into question (see, inter alia, judgment of 6 October 2009, Asturcom Telecomunicaciones, C‑40/08, EU:C:2009:615, paragraphs 35 and 36).
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