Applying Extensibility 

Extensibility of indexing

If you want more attributes to be indexed from your business objects in the search engine, you can implement your own ABAP class for the interface IF_COM_SE_BUSOBJ and assign it in customizing (see Providing Business Configuration). If the standard class is not flagged as final, your class can even be a subclass of the standard class. Then you do not need to copy methods that you need not change.

Extensibility of the F4 Search Help User Interface

The generic F4 search-help concept is extensible within itself:

By creating customer-specific append search helps, you can define your own elementary search helps for standard business object types. Your own search helps can appear in addition to the standard search helps or even replace the standard search helps.

For more information, read Menu ® Help ® Application Help on the search help definition screen in transaction SE11.