Action causes a conflict with a constrained summary task
The action you're attempting to take for this task causes a conflict with its summary task. The summary task is constrained. Microsoft Project cannot set the date for this task as you have specified because it conflicts with the constraint specified for the summary task.
Note: Go to Create and work with subtasks and summary tasks for additional information.
Using the Planning Wizard, you can:
Continue the action and remove the constraint on the summary task.
Project will change the task as you have specified and remove the constraint on the summary task so that there will be no conflict.
Cancel the action.
Project will cancel the action you have taken. You may also want to:
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Cancel the action and select the task row or the summary task row. Click Task Information, click the Advanced tab to see the task's constraint, and then click the Predecessors tab to see its task dependencies.
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Continue the change, and then set a different constraint for the summary task. For example, you might want to change the summary task's constraint to Start No Earlier Than a specific date. To change a task's constraint, double-click the task row, click the Advanced tab, and then click the constraint you want in the Constraint type box.
If you don't want the Planning Wizard to display this information again, select the Don't tell me about this again check box.