F4 help on table control

Hi,

I created a table control based on an internal table defined in my program. The internal table contains a field named VSTEL. and the corresponding screen element name is WA_VSTEL.

Now when the user presses F4 on this, I am able to display a list of values of my choice, user selects it and that gets associated with the first row's WA_VSTEL.

Now In the second row if I press F4, the value list is displayed, i am able to select the value , but the the selected value does not appear on the WA_VSTEL (2nd row's column !!).

i am sure I need to change my code so that I set the return value from CALL FUNCTION 'F4IF_INT_TABLE_VALUE_REQUEST'

to the corresponding row's WA_VSTEL.

i am not sure how to do that in my code...find below the POV code. any suggestions ??

TYPES: BEGIN OF X_VSTEL,

VSTEL TYPE TVST-VSTEL,

END OF X_VSTEL.

DATA: WA_ITAB TYPE X_VSTEL,

I_TAB LIKE TABLE OF WA_ITAB,

LT_DFIES_CSIT TYPE DFIES OCCURS 0.

CLEAR WA_ITAB.

REFRESH I_TAB.

SELECT DISTINCT VSTEL INTO WA_ITAB FROM TVST.

APPEND WA_ITAB TO I_TAB.

CLEAR WA_ITAB.

ENDSELECT.

CALL FUNCTION 'F4IF_INT_TABLE_VALUE_REQUEST'

EXPORTING

RETFIELD = 'VSTEL'

DYNPPROG = SY-REPID

DYNPNR = SY-DYNNR

DYNPROFIELD = 'WA_VSTEL'

VALUE_ORG = 'S'

TABLES

VALUE_TAB = I_TAB

FIELD_TAB = LT_DFIES_CSIT.