1. The option of defining custom code has been disabled in the context menu, for a request in Eclipse Kepler.
"custom code" feature is available from SMP runtime 3.0 SP04 onwards, as you are working on SP03, you won't find it. You can upgrade SMP server to SP04.
2. Also, i can't even see the option to define request mapping when i right click on a particular data source operation.
What is data-source here? SOAP WS? Can you share the steps followed?
Regards,
JK