You can apply constraints to a project task to impose a
fixed start or finish date for the task. Use the constraint types
'As soon as possible' and 'Finish no later than'.
About this task
You specify constraints when you plan the schedule (dates
and duration) of the project tasks. 'As soon as possible' is the default
constraint. If you want to specify this constraint for a task, you
do not have to make any changes. This constraint implies that the
task will start as close as possible to the specified start date so
long as the dependencies on the tasks are resolved on
schedule.
To apply the 'Finish no later than' constraint: