Rescheduling uncompleted work on unstarted tasks with constraints
Microsoft Project can't reschedule work on unstarted tasks with moderate or inflexible constraints. Finish No Later Than (FNLT), Start No Later Than (SNLT), Finish No Earlier Than (FNET), and Start No Earlier Than (SNET) are moderate constraints. Must Start On (MSO) and Must Finish On (MFO) are inflexible constraints.
Project will reschedule work on unstarted tasks with flexible constraints. As Soon As Possible (ASAP) and As Late As Possible (ALAP) are flexible constraints.
If you want to reschedule the work on these tasks, set the constraints to As Soon As Possible (ASAP) and try to reschedule these tasks again.
If you don't want the Planning Wizard to display this information again, select the Don't tell me about this again check box.