Syntax on set analysis instead of if condition

[canmarroig]

I need to calculate a KPI only if a dimension is greater than a number set in a variable

Sum({<Dimension={"=COUNT(Dimension)>$(vNumber)"}>} XXXXXX)

but it doesn't work, i don't want to use if condition for performance troubles, is it possible?

Tks

[pradosh_thakur]

generally it should be
Sum({<a unique field other than dimension ={"=COUNT(Dimension)>$(vNumber)"}>} XXXXXX)

but anyways if you replace the variable with a number , let's say 5 , does it work?