IV. EXERCISING THE JURISDICTION OF THE COURT
Article 8
(3) If after receipt of notification that in compliance with the third paragraph of Article 20 of the Statute the Court has initiated a proceeding in the same matter and against the same persons as a domestic court, the Republic of Slovenia shall not challenge the admissibility of the matter or the jurisdiction of the Court in accordance with the provisions of Chapter V of this Act, and the domestic court shall issue a ruling by which it dismisses the charges and if a charge has not yet been brought, a ruling by which investigation is stayed.
Admissibility challenge
Ne bis in idem - ICC
Admissibility challenge - ne bis in idem
EDIT.