Cost

Cost is unit cost for the item. 

If the Item Cost Method = "Average Cost", then Cost defaults to the Item's Average Cost or the Site's Average Cost if the item is stored in multiple sites.

If the Item Cost Method = "Standard Cost", then Cost defaults to the Item's Unit Cost or the Site's Unit Cost if the item is stored in multiple sites.

Cost is displayed only and used to calculate the Ext Cost field (Qty times Cost).