Guys,
We are doing some thing similar...
1) SF input can be cal or stored. (Data is coming at Country level)
2) SF output is always stored..( Data is needed at Regional level)
3) Use copy or calculate KF ( Sum up country level data to regional level of step1) as input to SF...
Hope this helpful...Call me if you have more questions +1 917 386 4187...
Thanks,
Krishna