When a cassation complaint reaches the Supreme Court, a single judge reads it and decides whether it deserves a hearing. If they refuse, they issue a short reasoned decision. Article 401.11(3) gives the Chairman of the Supreme Court and the deputy chairmen the power to disagree with such a refusal and issue their own decision referring the complaint to a hearing.
The same mechanism exists in supervisory review under Article 412.5. Both are discretionary. Neither creates a right to have the case heard — they create a person who may decide to hear it.