Problem in Creating a Gateway Service

Hi....I am new to Gateway.I am unable to add a service.Please help me out.

The steps I followed were

First I created the Project "Z_FLIGHT_DETAILS" as a local object.

Next I created an entity type...Right click on Data model->Import->DDIC STRUCTURE. There I entered the ABAP directory "SCARR". Selected the required fields and key.

Then generated the service on clicking the option "generate run time objects".

then navigated to transaction code /IWFND/MAINT_SERVICE and selected "ADD SERVICE". I gave LOCAL as my system alias and gave enter. I am not able to find the service in "activate and maintain services" which I have created.Instead of that it is showing "NO BACKEND SERVICES FOUND".

Please help me with the solution.

Thanks

Haritha