REG: Creating JCo destination

Hi Friends,Am in the process of creating a JCo destination for as a xRPM installation procedures.while creating JCo we got an error like ' Messageserver not defined and sytem name not defined and LogOn group name not defined '. we also got a doubt that which client we need to give for this process Master client(000) or The client that we have created(500).

Thanks in advance.