Jeevitha,
Are their any other outbound interface with ICO coming from the same source system?
If yes then please cross the check the setup which I mentioned above with existing one.
So being an ICO scenario the source system should target to send message to PI-AE but in your case it is sending to PI-IE. Since the source system is sending message to IE it is trying to search receiver determination(abap stack) but it can't find because you have ICO here(Java stack).
We would request you to put screenshot of your ICO and screenshot from ECC system for these tcode sm59- ( rfc destination type g ), sxmsif and sxmb_adm.
Br,
Manoj