You cannot enter a delay value here. You cannot enter delay in the following situations: On a task with an As Late As Possible ...

You cannot enter a delay value here. You cannot enter delay in the following situations: On a task with an As Late As Possible constraint in a project that is scheduled from a start date. On a task with an As Soon As Possible constraint in a project that is scheduled from a finish date. On a task with a Must Finish On or Must Start On constraint. On a task that has started or is a summary or inserted project task.