Strange behavior in ALV Grid

Hi all, I have an alv grid which it is updated in a report. But when I call the method grid->refresh_table_display the the refresh does not occur properly.
Let me give you an example:
This is the fieldcat:
FORM create_fieldcatalog.
  DATA: wa_fc   TYPE lvc_s_fcat.
  DATA: col_pos TYPE lvc_colpos.
  ADD 1 TO col_pos.
  wa_fc-col_pos    = col_pos.
  wa_fc-fieldname  = 'LIGHT'.
  wa_fc-tabname    = 'IT_DATA'.
  wa_fc-scrtext_s  = text-f01. "QA Result
  wa_fc-selddictxt = 'S'.
  APPEND wa_fc TO gt_fieldcat.
  CLEAR wa_fc.
  ADD 1 TO col_pos.
  wa_fc-col_pos    = col_pos.
  wa_fc-fieldname  = 'QA_APPROVED_BY'.
  wa_fc-scrtext_l  = text-f34. "QA: Approved by
  wa_fc-selddictxt = 'L'.
  APPEND wa_fc TO gt_fieldcat.
  CLEAR wa_fc.
  ADD 1 TO col_pos.
  wa_fc-lzero      = 'X'.
  wa_fc-no_zero    = 'X'.
  wa_fc-col_pos    = col_pos.
  wa_fc-fieldname  = 'QA_APPROVAL_DATE'.
  wa_fc-scrtext_l  = text-f35. "QA: Approval date
  wa_fc-selddictxt = 'L'.
  APPEND wa_fc TO gt_fieldcat.
  CLEAR wa_fc.
  ADD 1 TO col_pos.
  wa_fc-col_pos    = col_pos.
  wa_fc-fieldname  = 'QA_APPROVAL_COMMENTS'.
  wa_fc-scrtext_l  = text-f36. "QA: Approval comments
  wa_fc-selddictxt = 'L'.
  APPEND wa_fc TO gt_fieldcat.
  CLEAR wa_fc.
  ADD 1 TO col_pos.
  wa_fc-lzero      = 'X'.
  wa_fc-no_zero    = 'X'.
  wa_fc-col_pos    = col_pos.
  wa_fc-fieldname  = 'QA_APPROVAL_TIME'.
  wa_fc-scrtext_l  = text-f37. "QA: Approval time
  wa_fc-selddictxt = 'L'.
  APPEND wa_fc TO gt_fieldcat.
  CLEAR wa_fc.
And this is the modification I do:
    read table it_data index 1.
    it_data-qa_approved_by            = 'MYSELF'.
    it_data-qa_approved_comments = 'Test'.
    it_data-qa_approved_date = '01/01/2008'.
    it_data-qa_approved_time = '10:10:10'.
    modify it_data.
    call method grid->refresh_table_display.
  And now in the screen I can see the value 'MYSELF' in all the field of the modified record in the table.
Any ideas why this is happening??
Edited by: Mauro on Jan 24, 2008 3:46 PM

This is the form that does the update:
*&      Form  approveqa
FORM approveqa USING lcl_index.
  DATA: lcl_fields      LIKE sval OCCURS 0 WITH HEADER LINE,
        l_returncode(1) TYPE c.
  DATA: icon_ok  LIKE icon-name,
        icon_del LIKE icon-name.
  READ TABLE it_data INDEX lcl_index.
*- Only for batch that are not settled.
  CHECK ( it_data-light NE '1' ).
  lcl_fields-tabname    = 'YMM_BTCH_APPROVE'.
  lcl_fields-fieldname  = 'YYAPPBY_QA'.
  lcl_fields-fieldtext  = 'Approved by'.
  IF ( it_data-qa_approved_by IS INITIAL ).
    lcl_fields-value = sy-uname.
  ELSE.
    lcl_fields-value = it_data-qa_approved_by.
  ENDIF.
  lcl_fields-field_attr = '02'.
  APPEND lcl_fields. CLEAR lcl_fields.
  lcl_fields-tabname    = 'YMM_BTCH_APPROVE'.
  lcl_fields-fieldname  = 'YYAPPCOMM_QA'.
  IF ( NOT it_data-qa_approved_comments IS INITIAL ).
    lcl_fields-value = it_data-qa_approved_comments.
  ENDIF.
  lcl_fields-field_attr = '01'.
  lcl_fields-fieldtext  = text-t12.  "Commentary
  lcl_fields-field_obl  = 'X'.
  APPEND lcl_fields. CLEAR lcl_fields.
  lcl_fields-tabname    = 'YMM_BTCH_APPROVE'.
  lcl_fields-fieldname  = 'YYAPPDATE_QA'.
  IF ( it_data-qa_approved_date IS INITIAL ).
    lcl_fields-value = sy-datum.
  ELSE.
    lcl_fields-value = it_data-qa_approved_date.
  ENDIF.
  lcl_fields-field_attr = '02'.
  APPEND lcl_fields. CLEAR lcl_fields.
  lcl_fields-tabname    = 'YMM_BTCH_APPROVE'.
  lcl_fields-fieldname  = 'YYAPPTIME_QA'.
  lcl_fields-fieldtext  = text-t13.  "Time
  IF ( it_data-qa_approved_time IS INITIAL ).
    lcl_fields-value = sy-uzeit.
  ELSE.
    lcl_fields-value = it_data-qa_approved_time.
  ENDIF.
  lcl_fields-field_attr = '02'.
  APPEND lcl_fields. CLEAR lcl_fields.
  icon_ok  = icon_okay.
  icon_del = icon_delete.
  CALL FUNCTION 'POPUP_GET_VALUES_USER_BUTTONS'
       EXPORTING
            formname           = 'POPUP_ACTIONS'
            programname        = 'Y_MMPU_BATCH_APPROVE'
            popup_title        = text-t05  "QA Approval
            ok_pushbuttontext  = ''
            icon_ok_push       = icon_ok
            quickinfo_ok_push  = text-t06  "OK
            icon_button_1      = icon_del
            quickinfo_button_1 = text-t07  "Delete
       IMPORTING
            returncode         = l_returncode
       TABLES
            fields             = lcl_fields
       EXCEPTIONS
            error_in_fields    = 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.
  IF ( l_returncode EQ space ).
    READ TABLE lcl_fields INDEX 1.
    it_data-qa_approved_by = lcl_fields-value.
    READ TABLE lcl_fields INDEX 2.
    it_data-qa_approved_comments = lcl_fields-value.
    READ TABLE lcl_fields INDEX 3.
    it_data-qa_approved_date = lcl_fields-value.
    READ TABLE lcl_fields INDEX 4.
    it_data-qa_approved_time = lcl_fields-value.
    MODIFY it_data INDEX lcl_index.
  ENDIF.
ENDFORM.                    " approveqa
This form is called from the handle_user_command method whe the user press a button in the ALV Toolbar.
This is the habdle_user_command method:
  METHOD handle_user_command.
    DATA: lt_rows TYPE lvc_t_row.
    DATA: lcl_rows TYPE lvc_s_row.
get selected row
    CALL METHOD grid->get_selected_rows
             IMPORTING et_index_rows = lt_rows.
    CALL METHOD cl_gui_cfw=>flush.
    IF ( sy-subrc NE 0 ).
      CALL FUNCTION 'POPUP_TO_INFORM'
           EXPORTING
                titel = g_repid
                txt2  = sy-subrc
                txt1  = 'Error in Flush'(500).
    ENDIF.
    IF ( lt_rows IS INITIAL ).
      CALL FUNCTION 'POPUP_TO_INFORM'
           EXPORTING
                titel = 'ERROR!'
                txt2  = space
                txt1  = 'A line must be selected first'.
    ELSE.
      READ TABLE lt_rows INDEX 1 INTO lcl_rows.
      CASE e_ucomm.
        WHEN 'STATCHNG'.
          PERFORM statchng USING lcl_rows-index. "<-This perform is working ok when updating the table
        WHEN 'APPROVE'.
         PERFORM approve USING lcl_rows-index.
        WHEN 'APPROVEQA'.
          PERFORM approveqa USING lcl_rows-index.  "<- This is not.
        WHEN 'CONTRACT'.
          PERFORM contract USING lcl_rows-index.
       WHEN 'QASUMMARY'.
         PERFORM qasummary USING lcl_rows-index.
      ENDCASE.
      CALL METHOD grid->refresh_table_display.
    ENDIF.
  ENDMETHOD.                           "handle_user_command
I have debuged this program and the data on the internal table is stored correctly, I can see that each field has the correct values stored in it. But when I refresh the display In all the fields is shown the value of the first field only. And if I remove that field from the catalog, then the refresh will show nothing. This is very very rare.

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