Microsoft KB Archive/113726

Project: Increasing Duration of FNET Task Changes Start Date

PSS ID Number: Q113726 Article last modified on 09-18-1994

3.00 3.00a 4.00

WINDOWS

= SYMPTOMS =

In Microsoft Project, when you increase the duration of a task that has a constraint of Finish No Earlier Than (FNET), the task is scheduled with an earlier start date.

= CAUSE =

This is by design in Microsoft Project. When you increase the duration of a task, the early constraint date on the task does not change. If the task has a FNET constraint, this behavior causes the Start date to change, and the constraint behaves as a Finish No Later Than (FNLT) constraint instead of a FNET constraint.

= MORE INFORMATION =

In Microsoft Project version 4.0, if you enter in a finish date for a task, which sets a Finish No Earlier Than (FNET) constraint on the task, and you then increase the duration of the task, the task is scheduled with an earlier start date.

When you follow these same steps in Microsoft Project version 3.0, the task start date changes also, although the constraint on the task is different. In Microsoft Project version 3.0, when you change the Scheduled Finish date (Finish in Microsoft Project 4.0) of a task, the task is set with a Must Finish On (MFO) constraint.

Steps to Reproduce Behavior in Microsoft Project 4.0

 * 1) In a new project, enter a task, T1.
 * 2) In the Finish Date column for that task, enter one week from today’s date.
 * 3) On the Gantt Chart, drag the task bar for T1 to increase the task duration.

The task now has an earlier start date, even though the constraint on the task is FNET.

KBCategory: kbusage KBSubcategory:

= Additional reference words: 3.00 3.00a 4.00 =

Copyright Microsoft Corporation 1994.