When you want to edit a model that is already being edited by another user, you get a popup that informs you that the model is already edited by another user.
This message is shown way too short. By the time that you notice the pop-up it is often too late to read. Why not keep the pop up until you close it as a user ?
Additionally, it should be configurable what to present about the user that has the model in edit mode: ID or name or telephone or email or...