When setting this property: A valid point must not be father then 10 miles (approx. 16 km) from the origin. -or- When setting this property: The leader’s End point may not be placed at the current position of the Anchor or Elbow point.
When setting this property: The leader is not currently owned by a valid element. A probable reason for that could be if the element has been independently deleted, or the leader has never been properly initialized.
Remarks
The End point is the leader’s end that points to the object being annotated.