MRP area material to be excluded in Plant level MRP

Dear PP expert,

Business requirement is

MRP will be run on plant for all the RM , PM & SFG on Daily basis

For all the other Engeneering and consumable items we need to run the MRP on MRP area level on weekly basis

I created the MRP area and it was assigned to all the ENGG. & CONS items. In MRP 1 view MRP type is ND. In the MRP area MRP type is VB.

But when I run the MRP on plant level, system is considering all the MRP area materials also into the account and its creating the PR.

How to exclude the MRP area material(s) in the plant level MRP run.

Regards,

Ismail.A