Blocked Planned Orders creation in MRP run

Hi all,

Hope you are fine.

I need your help on this case.

Scenario:

Plant 1 received forecast as “Independent Requirement” from another soft (FuturMaster).

This IR contains needs from Plant 2 and Plant 3.

When MRP run on Plant 2 and Plant 3, he creates Planned Order which is taking into account by MRP on Plant 1.

So, MRP in Plant 1 run on Planned Order from Plant 2 and Plant 3 AND Independent Requirement from FM (then Plant 2 and Plant 3).

Planners at Plan 2 and Plant 3 need to see in their MRP Planned Order to Plant 1.

But, in order to prevent duplicate in Plant 1, we need to block the planned orders from Plant 2 and Plant 3 at Plant 1 level.

I do not know how to do it in a standard way.

Could you help me please?