Resource Mgr plan window is not getting activated with Oracle10g scheduler

Hi,

We tried to setup scheduler windows with resource plans, the resource plan did not get activated when the window started.

Before window starts i have issued the command ALTER SYSTEM SET RESOURCE_MANAGER_PLAN = my_plan

I can c active resource plan is available in v$rsrc_plan.

Any idea ?

Regards
Manoj

how do you know they are not 'activated'