Hello Midhun,
You should just configure your Web Dispatcher to forward requests to "/XISOAPAdapter" to the PI system.
Of, if the PI is the only backend of this Web Dispatcher, you can configure it to send all requests to the PI.
The Configuring the Web Dispatcher for Multiple Systems - Clarifications and Examples - Application Server Infrastructure - … WIKI page can help you with the Web Disp. settings.
Regards,
Isaías