Here is a list of most widely used ABAP statements:

AUTHORITHY-CHECK

This statement is used in ABAP to perform an authorization check. By setting a breakpoint on this statement, you will be able to see which authorization are checked by the program.

CALL SCREEEN

This statement calls a screen (also called DYNPRO) in the ABAP program.

MESSAGE

This statement is used to output a message in ABAP. If you set a breakpoint on this statement in the debugger, you can see which form (subroutine) or function module is displaying the message.

SELECT

The statement reads rows from database tables. By setting a breakpoint on the statement, it can bee seen, which database tables are accessed by the ABAP program.