We need to prevent resource manager from other department to see allocation of resources from not his department.
They have Global right Resource view all
There is used Resource Requisitions to allocate resources.
so they need Global right.
Project - Attach Requisitions Entry Resources - All
Project - View Requisitions - All
Via OBS they have
Resource - View book
Resource - Hard Book
But when Resource manager looking into for example Resource Workload portlet he can see Allocation for all resources not only on those where he has right View book.