88As a preliminary point, attention should be drawn, in that regard, to the importance, both in the legal order of the European Union and in national legal systems, of the principle of the authority of res judicata. In order to ensure both stability of the law and legal relations and 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 for in that connection can no longer be called into question (judgments of 6 October 2015, Târşia, C‑69/14, EU:C:2015:662, paragraph 28; of 24 October 2018, XC and Others, C‑234/17, EU:C:2018:853, paragraph 52; and of 11 September 2019, Călin, C‑676/17, EU:C:2019:700, paragraph 26).
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