Calendar Change Owner Action

In the Calendar ListView have one Action Called "Change Owner" this action permit users to re-asign the activity selected to other users. When you select the new user in the popup and press the button, all the data in the activiy is blank except the Assigned user.

To reproduce the bug go to Calendar --> Listview --> Create new Event --> save the activity.

• After this press the menu "Action --> Change Owner".
• Re-assign to other user and save. After the save action all the activity data are blank except the assigned to.