I have a cross-tab report that has service type in the column and month in the row. The summarized field is sum of service units. I want a parameter that filters by employee, however the employees change from month to month. I am trying to add a parameter that states if month{service.date} = [1,2,3] then {emp.id} in ["100", "101", "102"] AND IF month{serv.date} = [4,5,6] then {emp.id} in ["103","105"] etc. The employee changes from quarter to quarter. I tried this formula as a parameter and my report produced no data, if I take this out it works fine. What could I be doing wrong?