Order Management System applications optimize the way orders are presented to the transportation and warehouse management systems. Typically an OMS receives customer order information from the host system, and an up-to-the-transaction view of inventory availability from the warehouse management system and from trading partners via electronic data interchange transmissions. The OMS then groups an enterpriseÂ’s orders by customer and priority, allocates inventory by warehouse site, and establishes delivery promise dates. In a fully integrated system, the OMS passes those orders on to a TMS (Transportation Management System).