How to change the column title for custom F4 help(internal table)

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Hi Experts,

As per title, how do I change the column title for custom F4 help.

This F4 help is build by internal table.

Now the column title is F0001 & F0002, I want to change the F0001 & F0002 to something else.

Please help.

Below is my code.

TYPES: BEGIN OF gty_number,
num TYPE char4,
text TYPE char30,
END OF gty_number.

DATA: gtt_number TYPE STANDARD TABLE OF gty_number.
DATA: gwa_number TYPE gty_number.

SELECT-OPTIONS: s_number FOR gwa_number NO INTERVALS..

AT SELECTION-SCREEN ON VALUE-REQUEST FOR s_number-low.
PERFORM f_number_f4.

************************************************************************
* FORM f_number_f4 *
* Build F4 search help for number *
************************************************************************
FORM f_number_f4.

DATA: ltt_fieldtab TYPE STANDARD TABLE OF dfies,
lwa_fieldtab TYPE dfies.

FREE: gtt_number, ltt_fieldtab.

gwa_number-num = '01'.
gwa_number-text = 'Diagnosis in progress'.
APPEND gwa_number TO gtt_number.

gwa_number-num = '02'.
gwa_number-text = 'Estimated approval pending'.
APPEND gwa_number TO gtt_number.

gwa_number-num = '03'.
gwa_number-text = 'Waiting for spare part'.
APPEND gwa_number TO gtt_number.

gwa_number-num = '04'.
gwa_number-text = 'Ready for repair'.
APPEND gwa_number TO gtt_number.

gwa_number-num = '05'.
gwa_number-text = 'On going repair'.
APPEND gwa_number TO gtt_number.

CALL FUNCTION 'F4IF_INT_TABLE_VALUE_REQUEST'
EXPORTING
retfield = 'NUM'
dynpprog = sy-repid
dynpnr = sy-dynnr
dynprofield = 'S_NUMBER'
window_title = 'Number'
value_org = 'S'
TABLES
value_tab = gtt_number.

CLEAR gwa_number.

ENDFORM. "f_number_f4

Warm regards

Ice