You can create the pushbutton in your selection screen by applying statement ’SELECTION-SCREEN PUSHBUTTON ...’.

Example

TABLES sscrfields.

 
SELECTION-SCREEN BEGIN OF BLOCK b1 WITH FRAME TITLE TEXT-001.
  PARAMETERS: p_fld1 TYPE i DEFAULT 1,
              p_fld2 TYPE i DEFAULT 2.
  SELECTION-SCREEN PUSHBUTTON /1(10) Execute USER-COMMAND EXEC.
SELECTION-SCREEN END OF BLOCK b1.
 
INITIALIZATION.
  Execute = ’Testing’.
 
AT SELECTION-SCREEN.
  IF sscrfields-ucomm = ’EXEC’.
    MESSAGE I398(00) WITH ’Testing Pushbutton Action between value’
                          p_fld1 ’and’ p_fld2.
  ENDIF.

The output is: 


When you select the pushbutton, the output is:

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