Please see the long text of the message:
For your quick referal please see below:
You want to remove the deletion flag for WSB element . You cannot do this because the superior WBS element, , has status .
You can remove the deletion flag in the following situations:
The superior WBS element does not have the status "marked for deletion".
If the superior WBS element already has the status "closed", you can only remove the deletion flag for WBS elements, which also have the status "closed".
Remove the deletion flag at a higher level in the hierarchy, if necessary
Check the status of the superior WBS element:
Reset that first and then try to reset for the WBS element in question.
Hope its useful.
Reward points if useful.