52Furthermore, attention 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 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 16 March 2006, Kapferer, C‑234/04, EU:C:2006:178, paragraph 20; of 29 June 2010, Commission v Luxembourg, C‑526/08, EU:C:2010:379, paragraph 26; of 29 March 2011, ThyssenKrupp Nirosta v Commission, C‑352/09 P, EU:C:2011:191, paragraph 123; and of 10 July 2014, Impresa Pizzarotti, C‑213/13, EU:C:2014:2067, paragraph 58).
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