ABAP Enhancements are a new type of SAP extension. They are part of a new concept regarding extensions to the SAP system: using source-code plug-ins the customer may add code to explicit and implicit enhancements.
Previous extensions had some disadvantages that needed to be improved:
No Upgrade support for modifications and enhancements made in different systems of a transport route; that is, extensions created by SAP, customers orpartners add-ons
It is very hard to trace back into one system developments made in different parallel systems
The goal of this new Enhancement Concept is to unify all forms of extending the standard SAP System.
The Enhancement Builder is the tool for viewing, creating and editing the new enhancements. It is integrated in the ABAP Workbench.
These are predefined enchancement sections, usually defined by SAP. Explicit Enhancements are stored in Enhancement Spots. In program RIAUFMVK you can see some examples of them.
Explicit Enhancements are prety easy to implement; in the ABAP editor, get into the Enhancement Mode by clicking the spiral button. Then, right click into the enhancement point you plan to implement and select Enhancement Implementation->Create. You will be asked a name and a description and after this you can simply add your code.
This type of enhancement are predefined in the following places of an ABAP program:
At the end of an include (some restrictions apply; for example, at the end of a method include)
At the end of Private, Protected and Public sections of a Class
At the end of the Implementation of a Class
Before the END INTERFACE in an Interface definition
At the end of a structure definition
At the beginning and at the end of: forms, functions, methods
In the parameters list of a method, at the end of: CHANGING, IMPORTING and EXPORTING
To see what Implicit Enhancements are available, in the ABAP editor follow this path: Edit->Enhancement Operations->Show Implicit Enhancement Options.