Dropdown List in Tablecontrol

Question

Hi everyone!
I'm having trouble filling the dropdown lists that I have in a table control.
In the PAI, I'm filling the dropdown lists with the correct information. The problem is, that all of the dropdown lists (rows) are being filled with the same information. 
How I'm able to identify an specific field name of a row? (I think that is the problem).  Please any help solving this would be greatly appreciated.
Felipe.
This is the code that I have:
PROCESS AFTER INPUT.
  LOOP AT it_ztac0004.
    CHAIN.
      FIELD wa_ztac0004-id_tip_comision.
      FIELD wa_ztac0004-descripcion.
      FIELD wa_ztac0004-grp_comision.
      FIELD wa_ztac0004-opcion.
      FIELD wa_ztac0004-subscreen.
      FIELD wa_ztac0004-met_extraccion.
      MODULE tc_ztac0004_modify ON CHAIN-REQUEST.
    ENDCHAIN.
    FIELD wa_ztac0004-mandt
      MODULE tc_ztac0004_mark ON REQUEST.
    <b>MODULE set_drops.</b>
  ENDLOOP.
MODULE set_drops INPUT.
  DATA: wa_tabla4 LIKE LINE OF it_ztac0004,
        nombre_campo TYPE VRM_ID.
  DATA: it_lista1 TYPE VRM_VALUES,
        wa_lista1 LIKE LINE OF it_lista1.
  DATA: it_ztac0020 TYPE TABLE OF ztac0020,
        wa_ztac0020 LIKE LINE OF it_ztac0020.
  nombre_campo = 'wa_ztac0004-opcion'.
  READ TABLE it_ztac0004 INTO wa_tabla4 INDEX tc_ztac0004-current_line.
  IF sy-subrc = 0.
    SELECT * FROM ZTAC0020 INTO TABLE it_ztac0020
      WHERE grp_comision = wa_tabla4-grp_comision.
    if sy-subrc = 0.
      LOOP AT it_ztac0020 INTO wa_ztac0020.
        wa_lista1-key = wa_ztac0020-opcion.
        wa_lista1-text = wa_ztac0020-opcion.
        APPEND wa_lista1 TO it_lista1.
      ENDLOOP.
      CALL FUNCTION 'VRM_SET_VALUES'
        EXPORTING
          id                    = nombre_campo
          values                = it_lista1.
    endif.
  ENDIF.
ENDMODULE.                 " set_drops  INPUT

Answer 1

Hi Felipe Andres Contreras,
To get Drop Drown Box on screen  .
Follow these steps.
<b>1</b>.
Go to T.Code SE51 and Select Laypout for the Screen.
<b>2</b>.
Double click on the field for which u want Dropdown box.
<b>3</b>.
Then U will see Name ,Text ,DROPDOWN.Click on that and select List Box or ListBox with key . Better to to select first one.
<b>4</b>.
Save and Activate ur screen .
<b>5</b>.
Enter the following peice of code in the PBO of the screen.(Change for ur requirement).
<b>TYPE-POOLS :vrm</b>.
DATA:i_natio TYPE vrm_values,
w_natio LIKE LINE OF i_natio.
DATA: BEGIN OF i_t005t OCCURS 0,
land1 TYPE t005t-land1,
natio TYPE t005t-natio,
END OF i_t005t.
IF i_t005t[] IS INITIAL.
SELECT land1 natio
FROM t005t
INTO TABLE i_t005t
WHERE spras = sy-langu.
IF sy-subrc = 0.
LOOP AT i_t005t .
w_natio-key = i_t005t-land1.
w_natio-text = i_t005t-natio.
APPEND w_natio TO i_natio.
CLEAR w_natio.
ENDLOOP.
ENDIF.
ENDIF.
CALL FUNCTION <b>'VRM_SET_VALUES'</b>
EXPORTING
id = 'I_IT0002-NATIO'<b> This is screen field name</b>
values = i_natio
EXCEPTIONS
id_illegal_name = 1
OTHERS = 2.
IF sy-subrc <> 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
<b>6</b>.
Observe the above code and change as for ur requirement.
I think it helps a lot.
Let me know ,if u have any problem creating Dropdownbox.
<b>Thanks,
Venkat.O</b>