●　采购管理系统录入采购入库单 ,在库存系统对该入库单登记出入库台帐 ,在存货核算系统核算采购成本。●　销售系统开出销售发票 ,在应收系统核算该发票的款项。●　销售系统开出销售出库单 ,在库存系统对该出库单登记出入库台帐 ,在存货核算系统核算销售成本。●　库存系统? ● The purchasing management system inputs the purchase receipt, registers the entry and exit accounting in the receipt in the inventory system, and calculates the purchase cost in the inventory accounting system. ● The sales system issues a sales invoice and accounts for the invoice in the receivables system. ● The sales system opens a sales delivery order, registers the arrival and departure accounts with the delivery order in the inventory system, and calculates the sales cost in the inventory accounting system. ● Inventory system?