Event Not Triggered from SWEC

Dear Experts,

I have this custom Business Object that is maintained both in SWE2 & SWEC. Every time the Production Order is changed (CO02), the event is triggered successfully (I know this because an IDoc is triggered). Now, I copy the custom Business Object from SWO1, then maintained the same thing in both SWE2 & SWEC. But somehow my custom Business Object event is not triggered during the Production Order change. How to check/trace what is missing?

Thank you.

Regards.