ALV object in function module shows old data

Question

Hello,
I create a function module with import parameter matnr.
This function module calls a screen that displays an ALV with the whole info of matnr out of table mara.
I include this in a program where a material can be selected. This is then input for the function module. Everything looks good for the first material. However when the function module is called for a second material I still see the ALV with the data of the previous material.
When I debug the code I see that new data is selected and put on the alv (with method set_table_for_first_display)  but still I see the old ALV (which I free by the way in the exit of my function module...). It drives me crazy, what's the problem?
<b>My function module:
</b>
FUNCTION ZJVB_TEST.
*"*"Lokale interface:
*"  IMPORTING
*"     REFERENCE(I_MATNR) TYPE  MATNR
g_matnr = i_matnr.
call SCREEN 1979.
ENDFUNCTION.
<b>TOP include:</b>
FUNCTION-POOL ZJVB_TEST.                    "MESSAGE-ID ..
data: ok_code type sy-ucomm,
      container type ref to cl_gui_custom_container,
      alv type ref to cl_gui_alv_grid,
      g_matnr type matnr.
*&      Module  STATUS_1979  OUTPUT
*       text
MODULE STATUS_1979 OUTPUT.
  SET PF-STATUS 'FMAIN'.
*  SET TITLEBAR 'xxx'.
  if container is INITIAL.
    CREATE OBJECT CONTAINER
      EXPORTING
        CONTAINER_NAME              = 'CONTAINER'    .
    CREATE OBJECT ALV
      EXPORTING
        I_PARENT          = container.
    data: itab type TABLE OF mara.
    select *
      from mara
      into TABLE itab
      where matnr = g_matnr.
    CALL METHOD ALV->SET_TABLE_FOR_FIRST_DISPLAY
      EXPORTING
         I_STRUCTURE_NAME              = 'MARA'
      CHANGING
        IT_OUTTAB                     = itab.
  endif.
ENDMODULE.                 " STATUS_1979  OUTPUT
*&      Module  USER_COMMAND_1979  INPUT
*       text
MODULE USER_COMMAND_1979 INPUT.
  case ok_code.
    when 'BACK'.
      free container.
      free alv.
      LEAVE to SCREEN 0.
  ENDCASE.
ENDMODULE.                 " USER_COMMAND_1979  INPUT
<b>My program:</b>
*& Report  ZJEROEN_ALV_FM
REPORT  ZJEROEN_ALV_FM.
data: ok_code type sy-ucomm,
      l_matnr type matnr.
call SCREEN 1979.
*&      Module  STATUS_1979  OUTPUT
*       text
MODULE STATUS_1979 OUTPUT.
  SET PF-STATUS 'MAIN'.
*  SET TITLEBAR 'xxx'.
ENDMODULE.                 " STATUS_1979  OUTPUT
*&      Module  USER_COMMAND_1979  INPUT
*       text
MODULE USER_COMMAND_1979 INPUT.
case ok_code.
  when 'BACK'.
    leave to screen 0.
  when 'CALL'.
      CALL FUNCTION 'ZJVB_TEST'
      EXPORTING
                i_matnr = l_matnr.
endcase.
ENDMODULE.                 " USER_COMMAND_1979  INPUT
Thx for helping,
jeroen

Answer 1

Hello,
I found out that the container lifetime was the problem... When you create a container to put the ALV in the lifetime is set to default. Normally you never change this, I didn't mention it before I had the problem. But you have to change the lifetime to <your_instance_name>->lifetime_dynpro for instance my_container->lifetime_dynpro.
Also check this helplink: http://help.sap.com/saphelp_nw04/helpdata/en/9b/d080b79fc111d2bd68080009b4534c/frameset.htm