Hi Sonali,
Here is how to achieve it:
1. Add a field after the 5th one on the selection screen
2. In INITIALIZATION event hide it using:
LOOP AT SCREEN.
IF screen-name EQ 'P_FLD6'.
screen-input = 0.
ENDIF.
MODIFY SCREEN.
ENDLOOP. " LOOP AT SCREEN..
3. When the user clicks on the arrow button, within the AT SELECTION-SCREEN OUTPUT event, add if the sy-ucomm is that of arrow button then modify the screen to show the 6th field as:
LOOP AT SCREEN.
IF screen-name EQ 'P_FLD6'.
screen-input = 1.
ENDIF.
MODIFY SCREEN.
ENDLOOP. " LOOP AT SCREEN..
Let me know.