Authorization object for capacity planning CM03

Hi,

I have some authorization issue with CM03, capacity planning. The selection screen displays work center and plant. I would like to restrict only work center for plant A for user to choose. May I know how to do that?

From the screen menu, Planning->Selection->Select indv wrk cntr, all work centers for all plants are displayed. How to restrict to display only work center for plant A based on user authorization? May I know what authorization objects should I set?

Appreciate any guidelines.