ALV grid display-my columns are multiplying.

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.