Special considerations apply when several users work on the same item.
The software allows several users to concurrently access and edit the same item. In this case, the software accepts the changes for the first user to commit those changes. The software then saves the data committed by the second user overwriting the previously committed data.
Also, if a user deletes an item and commits the deletion, the software rejects changes
made by other users and those users cannot subsequently update the item because the
deletion takes priority. If you get a message that another user has modified or deleted
an item that you are working on, select Refresh 
or select another item and then reselect the item you were editing (if it has not
been deleted).