Oracle BPEL11g is not able to loop through multiple numbers

Hi

I am having async process A calling async process B. Based upon the result of process B , process A calls sync process C. Process A loop through passed numbers. After  looping through first two numbers ,process hangs thereupon.

Response of process A to the calling application is consolidated response of passed numbers in a request.

When I see into logs , it says transaction is rolled back to prior state.

I am not understanding , why process A is not able to loop through further numbers. If I am passing only two numbers it successfully loop through and gives proper response.