Hi
Implicit enhancement points are basically points within ABAP code where an enhancement point is implied, and in which case can be created. Examples of implicit enhancement points are at the beginning and end of FORM’s, at the end of a program, include or function module etc. Below is a step by step demonstration of how to create and implicit enhancement point.
Explicit enhancement points are basically hooks already coded into the program by SAP at various points of the code. See program RIAUFMVK for examples of these! These are very easy to implement simply go into enhancement mode of SE80 and right click on the enhancement point where you want to add your code and choose ‘Enhancement Implementation->Create’ Give it a name, description and assign it to a change request (should not be a Z package) and then simply add the code as normal
check the help
http://help.sap.com/saphelp_nw70/helpdata/en/94/9cdc40132a8531e10000000a1550b0/frameset.htm
Regards
anji
