Change of Budgeted Units / times Resources

Hi,

i have notice now , that primavera automatically calculates the budgeted units / time as equal to 1 , whenever i assign a resource to an activity....accordingly it calculates the Budgeted units...For eg if an activity is having 6 days duration , budgeted units taken by primavera is 6etc......

My earlier settings, was that , it calculates Budgeted units...whenever i assign a resource is as given below i.e.

Budget units = 8hrs (working hours per day) X duration of the activity.....

I want to return back to my earlier settings , can anyone guide me , how do i return back to my earlier settings???

thanks,

regards,

Haresh Jayanth