Hi Keerthan,
please take care, it's not enough to indicate in the task list system condition "0 - not in operation".
You have to specify the system condition separately in the maintenance item - click on the button "Task list detail" in maintenance item screen and then you have to maintain the system condition for the task list.
Now all orders created from this maintenance item will block capacity on the PP work center for the duration of the PM order.
Regards,
P