If an item on the invoice doesn't exist in your Inventory file, the system verifies that you have the Ace catalog installed on your system. It also verifies that the Electronic Invoice (ERP) was generated by Ace in the "expanded" record format.
The system uses the information from your Ace catalog when it adds an item to your inventory during ERP. However, if the item is not on file in the catalog, then the data in the Electronic Invoice (ERP) is used to add the item.
As of Level 24, the system will automatically add UPC codes that are transmitted with ERP. There is no way to turn this feature off, nor are the UPCs reported in any way. If you tell Ace to set the flag to create "expanded invoice records," then you will also receive alternate UPC codes.