user exit MB_CF001 in MIGO

Folks,

I am using the user exit MB_CF001 to get the data from XMSEG table and send it to an external system. I was asked to call an RFC function module in this user exit to send the XMSEG data to an external system but the user exit documentation clearly says not to use RFC function call in this user exit.

I also heard that I can do this by using the idocs that get posted after MIGO is done. Could anyone give me step by step procedure how to do this as I am new to IDOCS.

Points will be rewarded for best answers.

Thanks,

Alok