The first thing to do is :
Create 3 KPI objects:
3) count(distinct YourField)
And see what happens when u don't select anything and when u select a one or different values of YourField.
Based on what happens and what would be easier for u to define in ur expressions; choose one of the 3 above.
Hope that would help?
GetSelectedCount(InventoryReelsWhseCd) > 0
If you put InventoryReelsWhseCd in a variable you have to use the name of the variable, the field name will not work. For example, if your filter is $(vInventoryReelsWhseCd) then you must use GetSelectedCount("=$(vInventoryReelsWhseCd)") > 0
Qlik Sense 3.2 doesn't recognize $(vInventoryReelsWhseCd) and InventoryReelsWhseCd equivalent in the GetSelectedCount function.