In certain cases, where in one plant has multiple products, and certainly at the plant have more than one warehouse. If the product is made has some similarities or sometimes almost the same raw material used also has the same characteristics. So frequent exchange of materials between warehouses with one warehouse to another. If one runs out it will be filled by the existing stock in warehouse to another. Transfers between warehouses is the one who will become a serious problem. Stock transfer as in in the principle of lean manufacturing must be minimized if possible eliminated because it would add to the burden of the company. Expenses for the time used for the transport process both labor and fuel used for transportation.