It gives me an error saying my parameter field cannot be summarized. Here's the code...
if minimum({?PERIOD}) in cdate(2006,12,27) to cdate(2007,1,23) then "Period 1" else
if minimum({?PERIOD}) in cdate(2007,1,24) to cdate(2007,2,20) then "Period 2" else
if minimum({?PERIOD}) in cdate(2007,2,21) to cdate(2007,3,20) then "Period 3" else
if minimum({?PERIOD}) in cdate(2007,3,21) to cdate(2007,4,17) then "Period 4" else
if minimum({?PERIOD}) in cdate(2007,4,18) to cdate(2007,5,15) then "Period 5" else
if minimum({?PERIOD}) in cdate(2007,5,16) to cdate(2007,6,12) then "Period 6" else
if minimum({?PERIOD}) in cdate(2007,6,13) to cdate(2007,7,10) then "Period 7" else
if minimum({?PERIOD}) in cdate(2007,7,11) to cdate(2007,8,7) then "Period 8" else
if minimum({?PERIOD}) in cdate(2007,8,8) to cdate(2007,9,4) then "Period 9" else
if minimum({?PERIOD}) in cdate(2007,9,5) to cdate(2007,10,2) then "Period 10" else
if minimum({?PERIOD}) in cdate(2007,10,3) to cdate(2007,10,30) then "Period 11" else
if minimum({?PERIOD}) in cdate(2007,10,31) to cdate(2007,11,27) then "Period 12" else
if minimum({?PERIOD}) in cdate(2007,11,28) to cdate(2007,12,25) then "Period 13"
I tried changing my parameter to a date field, number, string, and still get the same error. What am I missing?