Can we use two Planner groups in SU3 tcode to download Notifications?

Hello experts,

                       I am working on SAPWM 6.2. I have to download the Notifications for Two Planner groups. In Config panel I have defined IHG parameter for Planner group. And in ECC tcode SU3, I have wrote two Planner groups for IHG parameter. But by doing this I am getting zero Notification downloaded in Syclo.  So how to fullfil this condition.  Can be possible  or to download notifications for two planner groups at a time. Any suggestions will be very helpful.

Regards

Sudhir