ABAP OO Class and Change Documents

I have created a class based on the IF_WORKFLOW interface. I created a couple of events. I created a workflow task assigned to a custom method of the class. I setup the Material Change Document to trigger the class event when there is a change. The workflow task does trigger when I change a material, but I don't know how to pass the key of the Change Document (matnr) to the workflow task/method using the ABAP OO Class interface. Any help?
Thanks,
Kenneth

Thanks for the reply Florin. Yes, I have seen Joclyn Dart's Whitepaper and blogs. They are very helpful, but I haven't seen much information within them about Change Documents. I tried your suggestions, but the material key is still not being filled when I trigger the change document and workflow task using tcode MM02.
Here is what I have done:
Created an Attribute 'Material' type mara-matnr and checked 'Key Attribute'.
Created an Attribute M_POR type SIBFLPOR.
Here are the methods:
Constructor with parameter 'Material' *
METHOD constructor.
me->m_por-catid = 'CL'.
me->m_por-typeid = 'ZMM_WF_MATTEC'.
me->m_por-instid = me->material.
ENDMETHOD.
Find_by_lpor with parameters LPOR and RESULT (default params) *
METHOD bi_persistent~find_by_lpor.
DATA: p_material TYPE matnr.
MOVE lpor-instid TO p_material.
TRY.
      CREATE OBJECT result
        TYPE
          zmm_wf_mattec
        EXPORTING
          material      = p_material.
    CATCH cx_bo_error .
      EXIT.
ENDTRY.
LPOR with parameter RESULT (default param) *
method BI_PERSISTENT~LPOR.
result = me->m_por.
endmethod.
ENDMETHOD.
Custom method MAT_CHANGED with parameter 'Material' * (not coded yet)
This is the task being triggered by the Change Documents *
METHOD mat_changed.
ENDMETHOD.
Edited by: Kenneth Moore on Nov 4, 2008 11:00 AM

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Type pool for icons - used in the toolbar
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Field for traffic light
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S T A R T - O F - S E L E C T I O N.
START-OF-SELECTION.
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CASE ok_code.
WHEN 'EXIT'.
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For parameter IS_VARIANT that is sued to set up options for storing
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Read data from datbase table
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Create objects for container and ALV grid
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EXPORTING container_name = 'ALV_CONTAINER'.
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EXPORTING
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Selection mode - Single row without buttons
(This is the default mode
gs_layout-sel_mode = 'B'.
Name of the exception field (Traffic light field) and the color
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gs_layout-info_fname = 'LINE_COLOR'.
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IF g_wa_sflight-paymentsum < 100000.
Value of traffic light field
g_wa_sflight-traffic_light = '1'.
Value of color field:
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g_wa_sflight-line_color = 'C610'.
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g_wa_sflight-paymentsum < 1000000.
g_wa_sflight-traffic_light = '2'.
ELSE.
g_wa_sflight-traffic_light = '3'.
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MODIFY gi_sflight FROM g_wa_sflight.
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Grid setup for first display
CALL METHOD go_grid->set_table_for_first_display
EXPORTING i_structure_name = 'SFLIGHT'
is_variant = l_layout
i_save = 'A'
is_layout = gs_layout
CHANGING it_outtab = gi_sflight.
*-- End of grid setup -
Raise event toolbar to show the modified toolbar
CALL METHOD go_grid->set_toolbar_interactive.
Set focus to the grid. This is not necessary in this
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CALL METHOD cl_gui_control=>set_focus EXPORTING control = go_grid.
ENDIF.
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MODULE user_command_0200 INPUT.
CASE ok_code.
WHEN 'EXIT200'.
LEAVE TO SCREEN 100.
WHEN'SAVE'.
PERFORM save_changes.
ENDCASE.
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FORM get_data.
Read data from table SFLIGHT
SELECT *
FROM zsflight
INTO TABLE gi_sflight.
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Reads the contents of the selected row in the grid, ans transfers
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Read index of selected rows
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IF l_lines = 0.
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EXPORTING
textline1 = 'You must choose a line'.
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so it is only ncessary to read the first entry in
table gi_index_rows
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IF sy-tabix = 1.
READ TABLE gi_sflight INDEX g_selected_row-index INTO g_wa_sflight.
ENDIF.
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Transfer data from the selected row to screenm 200 and show
screen 200
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DATA: l_traffic_light TYPE c.
Update traffic light field
Update database table
MODIFY zsflight FROM g_screen200.
Update grid table , traffic light field and color field.
Note that it is necessary to use structure g_wa_sflight
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