Enhancements in SAP ABAP

Difference Between Enhancement-Point And Enhancement-Section

The difference are :

Enhancement-point --  You can only add additional codes, you cannot change the existing code.

Enhancment-secton --  You can change or replace the existing SAP code.

There are 2 types of enhancements with the enhancement framework:

1. Explicit enhancement points: These 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 u2018Enhancement Implementation->Createu2019 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.

2. Implicit enhancement points: These 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 FORMu2019s, at the end of a program, include or function module etc.

Please go through this link for an example:

Implicit Example : 

http://www.sapdev.co.uk/enhance/eframework/ef_implicit.htm

Just check this example also related to frame work:

http://www.****************/Tutorials/Others/EnhancementFramework/demo.htm

Explicit Example :

http://wiki.scn.sap.com/wiki/pages/viewpage.action?pageId=77988719