SSAS 2008 multiple roles not applying

Hi,

I have two roles and two measures.

The first role can see all countries with measure 1 (exclude meaure two). This role works OK

And the second role can only see a few countries with measure two. The second role is not being applied and shows all the countries from role 1.

I'm using ssas 2008.

Any idea how to do this pls?

Thanks