How to find top n data from the alv report

hi abapers
i have alv report is displaying  2 columns material and rate.
i want to get only top 50 rate along with material  on the same screen  as we do similar thing in Tcode MC.5 pressing top n.
i m trying to find the solution for this for last 2 months
can u provide me the code how to do this as i m not able to understand mc.5 code for top n function.

Hi Deepika,
if you want the top 50 in the same screen, you can try the below logic.
Here assume that it_tab is the tbale displayed through ALV and user command
TOP_50 is to get the top 50 rate.
FORM user_command USING
     r_ucomm LIKE sy-ucomm.
  DATA lit_grid TYPE REF TO cl_gui_alv_grid.
  CALL FUNCTION 'GET_GLOBALS_FROM_SLVC_FULLSCR'
    IMPORTING
      e_grid = lit_grid.
  CASE r_ucomm.
     WHEN 'TOP_50'.
      it_tab1 = it_tab. "Copy to another tab
      REFRESH it_tab. "Clear the original
      SORT  it_tab1 BY rate. "Sort by rate
      DO 50 TIMES. "Only for top 50
        READ TABLE it_tab INTO wa_tab INDEX sy-index.
        APPEND wa_tab TO it_tab. "Fill the original tab
      ENDDO.
"Refresh the ALV
      CALL METHOD lit_grid->refresh_table_display.
ENDCASE.
ENDFORM.
Regards,
Manoj Kumar P
Edited by: Manoj Kumar on Mar 3, 2009 9:36 AM
Edited by: Manoj Kumar on Mar 3, 2009 9:39 AM

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