UndoCheckout():Void
Discards the current editing process for the data object.
If a data object has been checked out, then it is locked for editing for other users. In order to release this editing process for others, the data object must be returned or discarded.
This method discards the content modifications to the data object since it was checked out. The version generated when checking out is therefore no longer existent.
This method is used if the calling user has checked out this data object for editing. If another user has checked out the data object for editing and the calling user calls this method, then an AccessPermissionException is triggered. If the calling user has the role of user manager, then the method UndoCheckout can be called with the parameter true instead.
