ALV grid display-my columns are multiplying.

Question

I have been searching for the solution for my small problem..So I hope this question hasn`t been asked before.
I have an ALV grid in a pop up display using 'REUSE_ALV_GRID_DISPLAY'.
I have an input field on my screen that helps me display only certain keys on my alv grid.
When I input for example key 2 it shows all the correct products for that key 2.
When I try to enter another key....it shows the correct products but each column is duplicated. So each time I input something and hit 'Show' each column in that table is duplicated again.
Tried REFRESH, CLEAR my internal table....but I haven`t been able to make it work.
Did this happen to anybody ?
Newbie Ilinca
my input module for that screen:
when 'SHOW'.
       select col1 col2....
           into corresponding fields of table it_display
           from ztable
          where col1 = ztable2-col1.
CLEAR ls_fieldcatlog.
  ls_fieldcatlog-row_pos   = '1'.
  ls_fieldcatlog-col_pos   = '1'.
  ls_fieldcatlog-fieldname = 'COL1'.
  ls_fieldcatlog-tabname   = 'IT_DISPLAY'.
  ls_fieldcatlog-seltext_m = 'Infotype'.
  APPEND ls_fieldcatlog TO lt_fieldcatlog.
  CLEAR ls_fieldcatlog.
  ls_fieldcatlog-row_pos   = '1'.
  ls_fieldcatlog-col_pos   = '2'.
  ls_fieldcatlog-fieldname = 'COL2'.
  ls_fieldcatlog-tabname   = 'IT_DISPLAY'.
  ls_fieldcatlog-seltext_m = 'Infotype'.
  APPEND ls_fieldcatlog TO lt_fieldcatlog.
noloyo-zebra = 'X'.
noloyo-colwidth_optimize = 'X'.
CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY'
    EXPORTING
      i_callback_program    = sy-repid
      i_grid_title          = 'INFOTYPE DETAILS'
      is_layout             = noloyo
      it_fieldcat           = lt_fieldcatlog
      i_screen_start_column = 10
      i_screen_start_line   = 20
      i_screen_end_column   = 100
      i_screen_end_line     = 40
    TABLES
      t_outtab              = it_display
    EXCEPTIONS
      program_error         = 1
      OTHERS                = 2.
AND MY DECL:
TYPES: BEGIN OF type_com,
      col1TYPE ztable-col1,
      col2TYPE ztable-col2,
       END OF type_com.
DATA : it_display TYPE STANDARD TABLE OF type_com.

Answer 1

Hi ilinktrinel;
Please try to below code
first way;
refresh lt_fieldcatlog. "add only this row
CLEAR ls_fieldcatlog.
ls_fieldcatlog-row_pos = '1'.
ls_fieldcatlog-col_pos = '1'.
ls_fieldcatlog-fieldname = 'COL1'.
ls_fieldcatlog-tabname = 'IT_DISPLAY'.
ls_fieldcatlog-seltext_m = 'Infotype'.
APPEND ls_fieldcatlog TO lt_fieldcatlog.
CLEAR ls_fieldcatlog.
ls_fieldcatlog-row_pos = '1'.
ls_fieldcatlog-col_pos = '2'.
ls_fieldcatlog-fieldname = 'COL2'.
ls_fieldcatlog-tabname = 'IT_DISPLAY'.
ls_fieldcatlog-seltext_m = 'Infotype'.
second way;
if lt_fieldcatlog is initial. "add this row
CLEAR ls_fieldcatlog.
ls_fieldcatlog-row_pos = '1'.
ls_fieldcatlog-col_pos = '1'.
ls_fieldcatlog-fieldname = 'COL1'.
ls_fieldcatlog-tabname = 'IT_DISPLAY'.
ls_fieldcatlog-seltext_m = 'Infotype'.
APPEND ls_fieldcatlog TO lt_fieldcatlog.
CLEAR ls_fieldcatlog.
ls_fieldcatlog-row_pos = '1'.
ls_fieldcatlog-col_pos = '2'.
ls_fieldcatlog-fieldname = 'COL2'.
ls_fieldcatlog-tabname = 'IT_DISPLAY'.
ls_fieldcatlog-seltext_m = 'Infotype'.
endif. "add this row
Best regards.