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ABAP Source Code Enhancements 
As part of the enhancement concept, it is possible to enhance ABAP source code, without modifications, using source code plug-ins.
You can execute enhancements to implicit and explicit enhancement options. The Enhancement Builder tool for defining explicit enhancement options and for implementing enhancements is integrated in the ABAP Editor.

In the nomenclature of the enhancement concept, an enhancement option represents (in an ABAP source code) both the enhancement spot element definition, and the enhancement spot element call. A source code plug-in, however, refers to an enhancement implementation element of a (simple) enhancement implementation.
For more information about the usage of source code enhancements, see:
· Implicit Enhancement Options in ABAP Source Codes
· Explicit Enhancement Options in ABAP Source Codes
· Creating Source Code Plug-Ins