Keeping the materials they need in their warehouses at the right time eliminates both the inventory costs and the conditions for out-of-stocks. MRP determines what needs to be purchased, how much and when is needed, and when to order. On the other hand, for open purchase orders (orders with a balance), it also tells you that you can push the delivery date forward, pull it back, or cancel the current order by looking at the latest status of the plan. In this way, it tries to ensure that you do not keep unnecessary stocks or that the necessary ones are provided. The more applicable the messages given by the system, the lower your stock levels and the more relaxed your cash flow table will be.