You can prevent duplicate incoming orders from being processed inadvertently by flagging customers to automatically check for duplicate purchase orders. While in the Customer File Maintenance program and on screen 3, change line 12 to a value greater than zero. Setting the value to “3” would check all orders coming in from the customer for the previous 3 days. If the customer places an order using a purchase order that has already been used in the period defined then CODIS sends a mail message notifying everyone in the EDI CUSTOMER email group. This option is very helpful and recommended for customers ordering electronically (EDI, IC-COM, CODIS ACCESS, etc.) since they have been known to inadvertently send duplicate orders.