propose a problem in which each container should be filled in exact time. Machine scheduling problem is used as a model. In this model the transshipment platform is divided into loading and unloading areas. The arriving dates for incoming semi trailer are variable. The received Items are then either shipped away directly or sent to the exportation area in order to be loaded for reshipment. In this problem the time to start unloading semi trailer is scheduled in order that each loading semi trailer is completed at its due date