while importing my CSV file of DATA 01 actual and budgeted, , mapping for the forecast is not available as shown in the attached picture.
But then how come forecast is also throwing the same result as actuals, is it by default set to actual data?
That should be because of Switchover date. Go to Versions->Forecast->Switchover date
All the months prior to your switchover date will have actual values automatically copied to Forecast Version.
Hope that helps