Dual UOM

In Oracle inventory we have option to define dual uom for an item.Dual uom means we can track the transaction of an item in the primary as well as secondary UOM.in oracle applications we have database fields to store the data in the secondary uom as well as secondary quantity.
Please note that just defining an item in dual uom doesnot set the system to track the transaction of an item in primary quantity/UOM as well as secondary quantity/UOM.If we want to track an dual control item in dual UOM then while creating an item we sbould set "Tracking " as " Primary and Secondary".once done system will track all transactions in primary and secondary quantity and UOM.