Exception whiling sending the message to XI..

Question

Guys,
  Here is what we have:
We have a ICWC application, where in the agents enter some data about the customer. As soon as the agent saves the customer data,  a function module defined at the back end system  is called.
The function module at the back end system  does some addition processing and calls the  XI proxy by calling execute_synchronous method.
The message goes to CRM Queue and from there it does to the   XI system.
We want to simulate the exception during the  execute_synchronous method call.
How can we do it ?
ICWC --> save() --> FM1() --> XI_asynch_out-execute_synchronous()
Your response will be great !!.
We tried to disabling the CRM queues, did not work, We tried changing the RFC destination by having  wrong port number, did not work

Answer 1

not sure if this will work...but you can give try...
since it is a synchronous scenario...From XI do not send any response back to CRM system. CRM would be waiting for a synchronous response from XI and if the response does not reach within the timeout period the execute_synchronous will throw an timeout exception. If you are using BPM then you can introduce a wait step (wait time > HTTP timeout period)  before the BPM step which sends back the acknowledegment to CRM system.