Hi Zhi Jie,
sorry to bump into this thread, but I am a little stuck with a quite similar problem and since you already seem to have routed mails successfully(?), I hope you know more than me:
I get the route message, but do not know to reply to it (tried sending a variety of IciEvent_actionItemChanged events, but w/o success), could you peraps have a look at my post[1]?
Regards
Florian