Thank you very much Griffey you made my day. Yes what Griffy said is right. It is simple but spent one day to find it. Since i am new in calling stored proc.
Actually there will be a username and password given for making the connection. The username what i am using do not have permission for the another schema. Hence created a new connection with a userNaming having an access to that schema and then called the another proc. It works fine now :).
I guess it would be useful for the starters like me.
Thanks Griffey