How to provide validation for a particular field of screen

Hi Experts,
For my project, I have created a screen. In the screen, we have one field. For this field we have provided F4 help. When the user clicks on the F4 list of values is displayed.
I have to provide following condition for this field.
User should only select values from this F4 list only. If the user tries to enter any data which is not contained in the list, system should throw message that 'Invalid data. Select valid values".
Can you please let me know how I can do so?
The relevant portion of code is
CASE save_ok_code.
    WHEN 'EXIT'.
     LEAVE PROGRAM.
    WHEN 'BACK'.
      PERFORM exit.
    WHEN 'CANCEL'.
     LEAVE PROGRAM.
    WHEN 'SAVE'.
      CALL FUNCTION 'MESSAGES_INITIALIZE'.
      PERFORM check_batch CHANGING fl_error.
      IF fl_error IS INITIAL.
        PERFORM save.
        IF sy-subrc EQ 0.
          CLEAR gv_deleted.
          PERFORM update_alv_grid_display.
***for message display
          CALL FUNCTION 'MESSAGES_SHOW'.
        ENDIF.
      ELSE.
        CALL FUNCTION 'MESSAGE_STORE'
          EXPORTING
            arbgb = 'ZEX_MYPROJECT'
            msgty = 'S'
            txtnr = '053'
            msgv1 = text-008
          EXCEPTIONS
            OTHERS = 3.
        CHECK sy-subrc = 0.
        CALL FUNCTION 'MESSAGES_SHOW'.
      ENDIF.
    WHEN OTHERS.
      CALL METHOD cl_gui_cfw=>dispatch.
I am totally new for ABAP. So, please help me out.
Thanks
Smith

Hi,
Try this.
Create an internal table and populated it with the values present in the F4 help of the field. Then in AT SELECTION-SCREEN event check the value of the field with the values in the internal table and display the appropriate message.
Sharin.

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