CHAPTER II: COOPERATION WITH THE COURT
SECTION I: PRINCIPLES OF COOPERATION
Art. 4 Consultations
The Central Authority shall conduct consultations as indicated in article 97 of the Statute, in particular when the execution of a request:
c. would interfere with an ongoing investigation or prosecution of a different case (art. 94 para. 1 of the Statute)
Postponement - ongoing investigation or prosecution
EDIT.