58As regards the essence of that principle, it must be noted that, as the French and German governments pointed out in their observations, the execution condition laid down in Article 54 CISA does not call into question the ne bis in idem principle as such. That condition is intended, inter alia, to avoid a situation in which a person definitively convicted and sentenced in one Contracting State can no longer be prosecuted for the same acts in another Contracting State and therefore ultimately remains unpunished if the first State did not execute the sentence imposed (see, to that effect, C‑288/05 Kretzinger EU:C:2007:441, paragraph 51).
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