Data in itab does not show when using FM REUSE_ALV_POPUP_TO_SELECT

Question

Hello Experts,
I am using the said FM to display some data when the user clicks on a
custom button I made. But no data is displayed in the popup window. I
debugged it and the itab I am passing has a value in it. Below is my code:
WRITE icon_green_light AS ICON TO wa_legend-legend.
        wa_legend-column      = text-t05.
        wa_legend-description = text-d01.
        APPEND wa_legend TO lt_legend.
        IF sy-subrc <> 0.
          MESSAGE ID sy-msgid TYPE sy-msgty NUMBER sy-msgno
                  WITH sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.
        ENDIF.
        DEFINE m_fill_fieldcat.
          wa_fieldcat-fieldname = &1.
          wa_fieldcat-tabname   = &2.
          wa_fieldcat-seltext_m = &3.
          wa_fieldcat-icon      = &4.
          wa_fieldcat-outputlen = &5.
          append wa_fieldcat to lt_fieldcat.
          clear wa_fieldcat.
        END-OF-DEFINITION.
        m_fill_fieldcat 'LEGEND'      'ITAB' text-t04 'X' '14'.
        m_fill_fieldcat 'COLUMN'      'ITAB' text-t11 ''  '50'.
        m_fill_fieldcat 'DESCRIPTION' 'ITAB' text-t12 ''  '50'.
        CALL FUNCTION 'REUSE_ALV_POPUP_TO_SELECT'
          EXPORTING
*           I_TITLE                       =
*           I_SELECTION                   = 'X'
*           I_ALLOW_NO_SELECTION          =
            i_zebra                       = 'X'
*           I_SCREEN_START_COLUMN         =
*           I_SCREEN_START_LINE           =
*           I_SCREEN_END_COLUMN           =
*           I_SCREEN_END_LINE             =
*           I_CHECKBOX_FIELDNAME          =
*           I_LINEMARK_FIELDNAME          =
*           I_SCROLL_TO_SEL_LINE          = 'X'
            i_tabname                     = 'LT_LEGEND'
*           I_STRUCTURE_NAME              =
            it_fieldcat                   = lt_fieldcat[]
*           IT_EXCLUDING                  =
*           I_CALLBACK_PROGRAM            =
*           I_CALLBACK_USER_COMMAND       =
*           IS_PRIVATE                    =
*         IMPORTING
*           ES_SELFIELD                   =
*           E_EXIT                        =
          TABLES
            t_outtab                      = lt_legend[]
         EXCEPTIONS
           program_error                 = 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.
Hope you can help me guys. Thank you and take care!

Answer 1

Hi,
check this code and modify your FM accordingly then it'll work,
Q. i_checkbox_fieldname = 'CHECKBOX'
A. If the table output in the popup has checkboxes at the beginning of the rows (e.g. for multiple selection), the internal table must contain a field containing the value of the checkbox.
Assign the name of this field to the parameter I_CHECKBOX_FIELDNAME.
Q. i_tabname = 'TLINE'
A. This is the name of ur input help internal table
Q. it_fieldcat = fieldcat[]
A The table u gonna display has to have a fieldcat.
Q. it_excluding = extab[].
A. In case u wanna exclude some functions.
Below is a working example, paste it in se38 and activate.
!!! Warning SAVE IT AS A LOCAL OBJECT !!!
report ztests1.
type-pools: slis.
data: index type i.
data: l_kunnr like kna1-kunnr.
data: input(10) type c,
text(4) type c,
text1(5) type c.
data: begin of itab occurs 10,
kunnr like kna1-kunnr,
name1 like kna1-name1,
end of itab.
data: e_exit.
data: fieldcat TYPE slis_t_fieldcat_alv WITH HEADER LINE.
parameter: p_kunnr(10) type c.
at selection-screen on value-request for p_kunnr.
select kunnr name1 up to 10 rows
from kna1
into table itab.
fieldcat-tabname = 'ITAB'.
fieldcat-fieldname = 'KUNNR'.
fieldcat-seltext_m = 'Cust'.
fieldcat-ddictxt = 'M'.
fieldcat-outputlen = 10.
APPEND fieldcat.
CLEAR fieldcat.
fieldcat-tabname = 'ITAB'.
fieldcat-fieldname = 'NAME1'.
fieldcat-seltext_m = 'Cust Name'.
fieldcat-ddictxt = 'M'.
fieldcat-outputlen = 30.
APPEND fieldcat.
CLEAR fieldcat.
CALL FUNCTION 'REUSE_ALV_POPUP_TO_SELECT'
EXPORTING
I_TITLE = 'Customer Selection'
I_SELECTION = 'X'
I_ALLOW_NO_SELECTION =
I_ZEBRA = ' '
I_SCREEN_START_COLUMN = 0
I_SCREEN_START_LINE = 0
I_SCREEN_END_COLUMN = 0
I_SCREEN_END_LINE = 0
I_CHECKBOX_FIELDNAME =
I_LINEMARK_FIELDNAME =
I_SCROLL_TO_SEL_LINE = 'X'
i_tabname = 'ITAB'
I_STRUCTURE_NAME =
IT_FIELDCAT = fieldcat[]
IT_EXCLUDING =
I_CALLBACK_PROGRAM =
I_CALLBACK_USER_COMMAND =
IS_PRIVATE =
IMPORTING
ES_SELFIELD =
E_EXIT = e_exit
tables
t_outtab = itab
EXCEPTIONS
PROGRAM_ERROR = 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.
seshu.