Drawing Key Plan View object's approval status or permission group does not match with Drawing View object.
A Key Plan View object's Approval Status or Permission Group does not match with that of the View object. By design, a key plan view object must have the same approval status and permission group values as that of the parent View object.
This problem can potentially stop a delete or update operation on the drawing sheet.
What You Should Do
Run the Clean Database custom command, select the objects, and click Clean Now. This operation sets the correct approval status and permission group values on the Key Plan View objects.