I had added a ItemType object,then add a RelationshipTypes object,not hidden properties created_by_id, created_on, modified_by_id, modified_on.
First,add a data to this ItemType object and saved,here user is A.
Then,add some data to RelationshipTypes object and saved.
Next,another user B login,modify or add some data to RelationshipTypes object.
When user B click save button,all data of RelationshipTypes object's created_by_id, modified_by_id be changed to B and created_on, modified_on be changed to the current time.
