Hi Samantak ,
The Rule Policy Builder is available for many other application for e.g for Alert Triggering, ERMS, Order Routing.
From SAP HELP "The repository defines objects that are used for processing rule policies,and in some cases for integrating with the rule engine for background processing". In this case you define fields , actions and actions parameters which you use in Rule Policy Builder.
You are using order routing using rule policy builder.I would check my SAP system again to verify the functionality.
~Kavindra