EJB Adapter and Adapter Error

I am using Enterprise EJB Adapter 4.2 to connect to WAS 4.0. I have
no problem to call EJBs hosted in WAS. However I did not get failure
error message sent back to client (broker client). I was trying to use
try/catch block to send a Adapter::Error event back to client, but without luck. Anybody has any idea how to send a Adapter:Error (error reply) back to the client via Enterprise Integrator configured or scripted operation.

So far I found WM is great, EJB adapter is smart enough to detect the WAS server problem and restart itself, but sometimes broker client needs to know the error (back to old RPC days). I am using request/reply.