FM: Some dialog steps and functions are required frequently during the realization of application development dialogs. These are available as function modules in self-contained modules. Their use standardizes application dialogs, which in turn simplifies use.
The function modules provide a standardized dialog box with function keys which are tested at the end of the dialog. Depending on the function module, texts for information, for choices and/or for the available function keys can be passed.
You can get FMs using transaction SE37
BADI:BAdIs or Business Add-Ins are used to create predefined enhancement options in the SAP ERP components, which are then appropriately implemented by the individual industry solutions, country variants, or even by partners and customers.The new ABAP language elements and their additions ensure that these additional options can be used comfortably in ABAP programs. Within the Enhancement Framework, a new BAdI is always meant by the term BAdI
User Exits: User exits allow you to add additional functions to the SAP standard.
Programs with user exits contain subroutine calls at certain points in their syntax that are identified by the prefix USEREXIT. The actual user exits are located in an include that has been assigned to a module pool. This is where customers can include any changes (enhancements) that they want to make to the system. These includes are always processed during program flow.
In principle, customers can modify anything they want that is found in the include (tables, structures, and so forth).
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