F4 Help for a select-option

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Hi,

I have a requirement where i have to insert a F4 help for setheader-rvalue(business sector).

I have declared a select option for rvalue on the selection screen.

I have written a code like

*data declaration

DATA: w_setnr LIKE rgsbs-setnr.

CONSTANTS: c_rvalue LIKE rgsmh-field VALUE 'RVALUE',

c_table LIKE rgsmh-table VALUE 'SETHEADER'.

AT SELECTION-SCREEN ON VALUE-REQUEST FOR s_rvalue-low.

PERFORM search_group_value USING s_rvalue-low c_rvalue.

form search_group_value using group

fieldname.

DATA: w_searchfield LIKE RGSBS-searchfld.

w_searchfield = group.

CALL FUNCTION 'K_GROUP_SELECT'

EXPORTING

field_name = fieldname

searchfld = w_searchfield

table = c_table

IMPORTING

set_name = w_setnr

EXCEPTIONS

no_set_picked = 1

OTHERS = 2.

group = w_setnr(24).

endform. " search_group_value

when i go to the selection screen when i press f4 on rvalue it displays as * instead of the value from setheader table.

Kindly let me know how to use FM: 'K_GROUP_SELECT'.

Regards

Yamini.A