GEN Ticket: Till BZA can be confirmed or offered by charging due fare with receipt release!!
But if the ticket crosses BZA, the case differs. Think of 1 berth, which is empty till BZA but gets filled from BZA onwards!!
Now, TTE only can release berth till BZA or but not after BZA. After BZA, if person having CNF Berth from BZA doesnt turn up, then only TTE can release it to RAC Passenger & for this, he will have to wait tilll BZA.