After you delete a task, it may reappear in the project with the same
information and the following characteristics: it appears with a one-day
duration, it is scheduled to start on the same day as the project's start
date, and its
Name field is left blank.
One possible cause for this problem is that you have used the
Paste Link command to link the
Predecessor or
Successor field of a task from one project file to another.
If you enter an ID number for a task that does not exist in the
Predecessor or
Successor field, Microsoft Project will create a task for that ID number. The new task's
Scheduled Start will be the start of the project and have a duration of one day. The
Name field for this task will be blank.
In the same respect, if you link the
Predecessor or
Successor field to another project file, Microsoft Project will create a new task for the ID of the linked task if the task does not exist. When you use the
Paste Link command, you establish an automatic link between the two project files. If you delete the new task or tasks, Microsoft Project will update the linked information of the
Predecessor or
Successor field and therefore recreate the task.