63In that regard, the principle of res judicata is, both in the legal order of the European Union and in national legal systems, of particular importance. 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 (judgment of 11 November 2015, Klausner Holz Niedersachsen, C‑505/14, EU:C:2015:742, paragraph 38 and the case-law cited).
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