Counting distinct.

Good day everyone,

I have data similar to this ilustration.

I'm trying to count the distinct months in the dataset.  I tried creating measures with the following settings a none works when I include dimension table fields in the query.

count(distinct month)  projection sum

count(distinct month)  projection none

count(distinct month)  projection count

count(distinct month)  projection delegated -->  this one display  #torefresh in webi when the object is used on a drill .

For this example the measure should always count 3.   Any idea to get this to work on the universe ?  

Thanks in advance.