92Attention should be drawn to the importance, both in the legal order of the European Union and in national legal systems, of the principle of res judicata. 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 final after all rights of appeal have been exhausted or after expiry of the time limits provided for in that regard can no longer be called into question (judgments of 3 September 2009, Fallimento Olimpiclub, C‑2/08, EU:C:2009:506, paragraph 22; of 17 October 2018, Klohn, C‑167/17, EU:C:2018:833, paragraph 63; and of 2 April 2020, CRPNPAC and Vueling Airlines, C‑370/17 and C‑37/18, EU:C:2020:260, paragraph 88 and the case-law cited).
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