How to create Event for a BO

Hi Experts,

I am developing WF for tcode MD03, this transaction is used to create planned order.

I need to trigger a WF to send mail when ever a Planned order is created using MD03 tcode.

BUS2004 is the BO for Planned order, but this BO does not have any event linked to it. So my question is how to create a event to a BO.

Also, I used BTE to create a Z function module, this FM is getting triggered whenPlanned order is created using MD03 tcode. Is it possible to trigger a WF using this FM?, If yes, how?

Thanks in advance.

Regards

Balu