58On the other hand, if the referring court is led to the view that the correct application of that legislation conflicts, having regard to the applicable domestic rules of procedure, with its Judgment No 4267/2007 or with its decisions of 15 April and 3 December 2010 implementing that judgment, 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 in Kapferer, C‑234/04, EU:C:2006:178, paragraph 20; Commission v Luxembourg, C‑526/08, EU:C:2010:379, paragraph 26; and ThyssenKrupp Nirosta v Commission, C‑352/09 P, EU:C:2011:191, paragraph 123).
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