error: exposing RFC as a web service

Hi Experts

I am exposing RFC as a web service.

But while trying to release the webservice, in the last step it's saying

Note: That the service doesnt have a runtime release and therefore cannt be used.

This can be created in SOAMANAGER

But,when I am trying to run this t-code, it's saying " T-code doesnt exist"

Pls help me in resolving the issue

Thanks