kill the RFC connection as soon as the call is completed in Web Dynpro JAVA

Hi Experts,

Please guide us how to kill the RFC Connection from web dynpro java as soon as the execution is completed.The FM connection (Adaptive RFC) isnt getting closed in IS-U side. Please guide us how to close them explicitly.

We are getting the following error

(102) RFC_ERROR_COMMUNICATION max number of cpic clients exceeded (300)