Editing Tasks and Schedule Recalculation

When you edit and save a task, PPM recalculates the schedule of the task. Depending on what changes you made and on certain external conditions, this recalculation can result in changes to the schedule.

Expected Changes

When you change values that directly impact scheduling (Planned Start, Planned Finish, Duration, and Planned Work) or add or remove assignees, there is a reasonable chance that your schedule will be adjusted as a result.

Unexpected Changes

You can also change values that are not directly related to scheduling (Description or Priority for example) and impact the schedule (dates or duration can change). There are a number of reasons why this might happen, but generally these schedule adjustments on edit are a result of some other, "hidden" change that impacts the task but is not registered until/unless you edit the task.

Dependencies—Dependencies on other tasks can result in a schedule adjustment when the task is edited.
Nonworking Time—Nonworking time added after the task was created is not reflected until the task is edited. Note: Managers see a message about impact of new nonworking time on an existing schedule when they navigate to their workspace.
Calendars—Changes to the calendar(s) used for task scheduling do not impact the task until the task is edited. For example, if a resource calendar is deleted, the resource is reassigned to the default enterprise calendar but the scheduling of any existing tasks does not take this change into account until the task is edited.

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