Article ID: 197333 - View products that this article applies to.
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In Microsoft Project, when you drag to move a summary task, the outline structure of the summary task and subtasks may be lost.
This problem occurs when you apply a task filter and then drag a summary task between its own subtasks.
When you place a summary task between two of its subtasks, a logical outline structure cannot be maintained because a task cannot be both a summary task and its own subtask.
To correct this problem after it has occurred, re-create the original outline structure.
To avoid this problem, do not move a summary task between two of its subtasks.
NOTE: To show all of the subtasks that belong to a summary task, filter the project with the All Tasks filter.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.
Article ID: 197333 - Last Review: January 7, 2015 - Revision: 5.0