Get the predicted start start of an activity in a certain tracking period.
This function can only be called after P2Tracking:construct_schedule_prediction calling the function. The predicted start times are different for finished activities, activities in progress and activities that still have to start, as follows:
| I/O | Type | Name | Description |
|---|---|---|---|
| input | integer | ID | activity ID |
| input | integer | ID | ID of the tracking period |
| output | integer | start | activity start time or 99999999 when already finished |