About API Driven Forecasting
You can generate forecasts through batch mode using the Forecast 2000 - Forecast Service business service, which is provided by default with your Siebel business application.
To generate forecasts through batch mode, you must implement the functionality that is available with the Forecast 2000 - Forecast Service and decide, for example, when and how often to run the batch mode forecasting job.
The same forecast-related limitations apply to API driven forecasting as apply to forecast generation and rollup in general.
Note: When generating forecasts through batch mode, if a forecast is being
created for a participant who has subordinates and the subordinates have
not created their forecasts yet, then the forecasts for subordinates
are created automatically.