In this blog we can see how to register and build a custom handler through BMIDE. Please refer my previous blog  Setting up BMIDE for coding and building DLL  to set up BMIDE for coding. Register Custom Handler Make sure you have a active library defined in  Extensions\Code Generation folders. If you need a new library for managing handlers, create a new library and make it as active library. Create a custom extension rule. Open the Extensions\Rules folders, right-click the Extensions folder, and choose New Extension Definition.  In Extension dialog box, along with Name of the extension and click the Add button to the right of Availability table. Select the business object as Session, Business object as Type, Operation as BMF_SESSION_register_epm_handlers and Extension Point as BaseAction. Extension availability Click Finish Extension view Add your custom extension as a base action on the BMF_SESSION_register_epm_handlers operation. Open the Session business object and click the Oper