PM Master -Influencing field addition in Screen sequence ??

Hello all,

Is it possible to modifiy the Influencing field in the Field selection-Influencing fields.....?

Requirement is that we have to make one field in the Equipment and Functional location master mandatory field for some plants and not mandatory for some other plants.So if i can add plant as an influencing field along with eqpt category it would be easy....

How to do this....???

Thanks for the support.

Shashi