CHAPTER II: COOPERATION WITH THE COURT
Section 3: Communication with the Court
Art. 10 Form and transmission of requests of the Court
4 The Central Authority shall immediately inform the Court of the inadmissibility or denial of a request and shall explain its decision. The Central Authority shall consult with the Court before the definite denial of a request.
Admissibility challenge
Refusal of ICC request
Obligation to inform the Court of reasons for denial of assistance
EDIT.