Following link would be helpful for your understanding:
Finding the user-exits of a SAP transaction code : http://www.sap-img.com/ab038.htm
http://help.sap.com/saphelp_46c/helpdata/en/1c/f62c7dd435d1118b3f0060b03ca329/content.htm
http://www.sap-img.com/abap/a-short-tutorial-on-user-exits.htm
http://www.sap-img.com/abap/what-is-the-difference-between-smod-and-cmod.htm
http://sap.niraj.tripod.com/id21.html
Hope this helps.
Please assign points as way to say thanks
Ravi
Prashanth,
this question would be more suitable for the ABAP forums .. redirecting to the ABAP forums....
Arun
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