For example, suppose you have a 1-day fixed duration task starting on October 17, 2003 with one resource assigned and later ...

For example, suppose you have a 1-day fixed duration task starting on October 17, 2003 with one resource assigned and later you set the same day as non-working for the resource. To complete the eight hours of work assigned to the task, the finish date of the task (and therefore the duration) needs to change to accommodate the resource's updated schedule.