A restriction you impose on an activity that sets its early and late start dates equal to the date you specify. The mandatory early start date is used regardless of its effect on network logic. A mandatory early start date could affect the late dates for all activities that lead to the constrained activity and all early dates for the activities that lead from the constrained activity.
Note
- When mandatory constraints are placed on calendar nonworktime, the early and late dates are not set equal to each other. The early date is moved forward to the next valid worktime and the late date is moved back (earlier) to the first valid worktime. This can cause negative float in the schedule.