Filter

Hi

I have 1 table with columns called "forecast days" "date" "resource name" and so on

i set the page filter to allow the user to select the month

i then need a number figure which does the following:

tell me the number of resources that have more than 20 days assigned (which is forecast days) to them as a sum for that month

i cant seem to get any number displaying other than 1...

please help

thanks

Nikki