Set Analysis

[AleCruc94]

Hi, 

I want to know how to incluse a set analysis into the following formula

=Aggr(if(rank(sum(Sales))<=3,Clustomers),Clustomers)

as i want to obtain in a table the top 3 customer for sales but for a specific activiti, so that I need to inclued a prefilter in this formula as {ACTIVITY = 'COP. TASSO'}

Thanks in advance

[Taoufiq_Zarra]

if i understood correctly

=Aggr(if(rank(sum({<ACTIVITY={'COP. TASSO'}>}Sales))<=3,Clustomers),Clustomers)