38If such a measure or interpretation should, however, prove not to be possible, 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 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 for in that regard can no longer be called into question (see judgments in Fallimento Olimpiclub, C‑2/08, EU:C:2009:506, paragraph 22, and Târșia, C‑69/14, EU:C:2015:662, paragraph 28).
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