Get change document data

How do we get the change document data to be used in a workflow,

I have made entry in swec , there i associated the change object and my zbo delegeted from standard bo and specified the event as "on change". now i want to send a mail using this changed data.

I have two options either i use an exit fm to trigger the mail or use a workflow to trigger tha mail, but how do i use the changed data that i get from cdhdr, i need to specify these fields in tha mail body.

or if i choose to use an exit fm how to do it.

regards,

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