How to call Function Module in Selection Screen

Hi All,
I have developed one HR Report (Qualification Overview Report: To display all active employees and their Qualifications along with their Proficiency).
Already it has 3 selection fields on selection screen and now I want one more field on selection screen like Qualification Id.
But when the end user press F4 it should display the Popup which comes in TCode: PA30 at the time of Creating Qualification.
I have debugged the Standard Code and searched the Function Module: 'RH_OBJID_REQUEST' which shows Popup which I wanted to show at Selection screen for newly added field.
So I have to define new field like 'Qualification Id' and want to attach above Function Module so that it will cater my requirement.
If anybody has worked on this type of requirement then please let me know.
Thanks,
Jay.

Hi Raymond,
I have written following code:
s_quali is used in selection screen for Qualification Id.
SELECT-OPTIONS : s_quali   FOR hrp1000-objid NO INTERVALS.
AT SELECTION-SCREEN ON VALUE-REQUEST FOR s_quali-low.
CALL FUNCTION 'RH_OBJID_REQUEST'
    EXPORTING
      plvar           = '01'
      otype           = 'Q'
      seark           = '*'
      seark_begda     = '18000101'
      seark_endda     = '99991231'
      set_mode        = 'X'
    TABLES
      sel_objects     = git_objects.
LOOP AT git_objects INTO wa_objects.         " Logic is to fill up the Selection screen field
    s_quali-low = wa_objects-objid.
    APPEND s_quali TO s_quali.
    CLEAR : s_quali, wa_objects.
ENDLOOP.
Now problem is that, its not populating all values in selection screen which I select from Popup screen (Choose Qualification).
I checked that the first value in the internal Table is over written by second records in the internal table
For e.g.: If I select 001,002,003,004 from Popup screen then I am able to see only 002,003,004 in the Multiple selection view of that field though it is available in the internal table s_quali (because I am filling up the table using Loop-Endloop)
Please advise me how to overcome this issue. (How to fill up selection screen)
Thanks,
Jay.

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