Table - tree

Dear Friends,
    I have a requirement to display an output using Tree; as I am very new to WDA I am trapped in the middle of my design. Can anyone provide me an insight of how to achieve the requirement below,
I have table org_data with following columns
Org_unit org_desc goal_key
I have another table goals with following columns
Goal_key Goal_Desc
I wanted a tree to be displayed as follows,
Org_Unit1 (Org_Unit Desc)
    --Goal1 (Goal_Desc)
    --Goal2
    --Goal3
Org_Unit2
    --Goal2
    I thought of using the Table (Table master column) and the Tablebykeycolumn.
In this case, how should define my context and what values should I pass for the Parentkey, rowkey etc. Any other thoughts for achieving it is also appreciated.
Thanks,
Kanthimathu

I referred to the following post in the Wiki page,
https://www.sdn.sap.com/irj/sdn/wiki?path=/display/profile/2007/09/11/integrationofTreeStructureinaTableusingWebdynpro+Abap&
it solved my problem.

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Edited by: Tom Van Doorslaer on Sep 1, 2008 5:43 PM

Dump extract:
What happened?
    In the running application program, the ASSERT statement recognize
    situation that should not have occurred.
    The runtime error was triggered for one of these reasons:
    - For the checkpoint group specified with the ASSERT statement, th
      activation mode is set to "abort".
    - Via a system variant, the activation mode is globally set to "ab
      for checkpoint groups in this system.
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Error analysis
    The following checkpoint group was used: "No checkpoint group specified
    If in the ASSERT statement the addition FIELDS was used, you can find
    the content of the first 8 specified fields in the following overview:
    " (not used) "
    " (not used) "
code extract:
   60
   61     when cl_wd_tree_by_nst_table_col=>cid_tree_by_nst_table_col.
   62       nst_table_col ?= m_wd_row_arrangement.
   63
   64       " TableTreeByNesting does not accept a fixed row count
>       assert m_fixed_row_count = c_no_fixed_row_count.
   66
   67       concatenate m_data_source_path_name '.' into match_path.
   68       len = strlen( match_path ).
Active Calls/Events
No.   Ty.          Program                             Include                             Line
      Name
   19 METHOD       CL_WDR_TABLE_DATA_PROVIDER====CP    CL_WDR_TABLE_DATA_PROVIDER====CM001    6
      CL_WDR_TABLE_DATA_PROVIDER=>GET_TABLE_DATA
   18 METHOD       CL_WDR_TABLE_DATA_PROVIDER====CP    CL_WDR_TABLE_DATA_PROVIDER====CM008    1
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   16 METHOD       /1WDA/L8STANDARD==============CP    /1WDA/L8STANDARD==============CCIMP   34
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   15 METHOD       /1WDA/L8STANDARD==============CP    /1WDA/L8STANDARD==============CCIMP   16
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   14 METHOD       /1WDA/L7STANDARD==============CP    /1WDA/L7STANDARD==============CCIMP   58
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ME->M_FIXED_ROW_COUNT
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ME->C_NO_FIXED_ROW_COUNT
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    FFFF
Edited by: Tom Van Doorslaer on Sep 2, 2008 8:34 AM
Edited by: Tom Van Doorslaer on Sep 2, 2008 8:35 AM

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