Workflows : Reg Check FM and Reciever FM of Events

Hi,

I read that Check Function Modules and Receiver Function Modules can be written to have more control over the Events. I understood the theory, but when I go for the implementation, Am unable to create the CHECK FM or RECIEVER FM. I just want to know if we have to create these Functon Modules manually with the defined INTERFACE and then attach them to the events in SWETYPV?

Or is there any way of automatically creating this CHECK FM and RECIEVER FM interface definition , where we have to just enter our coding.

Please let us know.

Regards,

Raja Sekhar.