PO Amendment IDOC to be posted by workflow

[Gupta Sanjeev (MUM)]

Hi All,
 
My client is having one requirement of making sales order change from an
IDOC received from his customer. The client does not want to make these
changes without prior approval, he wants to see first what changes customer
has made. How can I read the IDOC and find the changes? How These changes
can be framed in a mail?
 
Thanks in advance.
 
Regards,
 
Sanjeev Gupta