MDX query to calculate capacity of generic resources

Hello,

In our organization, we want to exclude from the capacity the generic resources. I would like to build an OLAP cube with a specific definition of capacity such as:

MyCapacity = IIF([Resource is Generic],0,[Capacity])

So the OLAPCube ResourceTimePhased would calculate a capacity only for resources that are not generic.

However it doesn't work. The expression is always evaluated to False and the default capacity is returned. I tried different ways but no success either.

Any idea on how to do this?

Thank you.