86The Court of Justice has already drawn attention to the importance, both in the European Union legal order and in the national legal orders, 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 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 (Case C-234/04 Kapferer [2006] ECR I-2585, paragraph 20; Case C-526/08 Commission v Luxembourg [2010] ECR I-6151, paragraph 26; and Case C-352/09 P ThyssenKrupp Nirosta v Commission [2011] ECR I-2359, paragraph 123).
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