Counting rows based on attribute value

[lukagent]

Hi all, I'm quite new to mdx and i'm trying to count only those cells which have a given value in a certain attribute ... I've tried this:

with member [dept].[comandati fs] as
count(existing [emp].[fuori sede].&[1]))
select ([Time].[Periodo].[Giorno].&[2008-05-12T00:00:00],{[Measures]... ... ...}) on columns,
{{[dept].[comandati fs]}}
on rows 
from mycube
where (EXCEPT([dept].members,[NON VALID VALUES]),
       intersect([emp].[tipo personale].members,[valid employee types]),
      [dept].[country].&[I])

NB: in the last row of where clause i'm just doing the same (filtering only those depts whose country atribute is , buit it seems not to work with emps' [fuori sede] attribute
any idea?
Thanks in advance,

Luca