Access control on service definition within the PI service registry?

Hi, all

I know that you can assign the role services_registry_read_only to user so that he can read and run the web services defined in the PI service registry. But is there a way to fine tune the access control on the service definition. I want a user to only access certain service definition while not able to access the others. The reason is obvious as some of the web services are confidential.

Is there a way to do so?

Thanks,

Jonathan.