OO ALV validation check without event DATA_CHANGED and results via popup

Hi Gurus,
I'm working on SAP ECC 6.0 and I'm facing a problem during the ALV validation check. My requirement is to show an ALV with one editable field. In addition I have to pre-initialize this field in order to give a reference value to the user, but this is not always correct, or better, this field represent the maximum amount available, but, because of other validation checks, this field is not always correct (and it's ok, it's not a problem), and if it is greater than another amount I have to display an error.
I was thinking about catching the event DATA_CHANGED and do the checks inside of it. It works but not completely, because if the user do not change anything the event is not raised and I cannot do my checks.
My solution is to do the checks without catching the DATA_CHANGED event and display the errors in a separate popup window.
The checks are ok, but I have problems during the displaying of the results: I would like to use the class CL_ALV_CHANGED_DATA_PROTOCOL in order to display the errors, I tried creating the Object:
Data: go_Error Type Ref To CL_ALV_CHANGED_DATA_PROTOCOL.
Create Object go_Error
    Exporting
*      i_container =
      i_calling_alv = go_0200_Alv
giving it a reference to the ALV (the go_0200_Alv is my CL_GUI_ALV_GRID object).
Then I did many Call Methods to the Add_Protocol_Entry to add the message in the protocol and then display them calling the Display_Protocol Method of my "go_Error".
The Popup is shown and the "links" to the ALV are correct (if I double click a message it selects the corresponding row of the ALV, but (and it's my problem) I cannot see the Description of the Column with the error: the popup window is an ALV grid itself with 3 columns ("Message Type", "Name of the Column" and "Message Text") where I can see correctly the Message Type and the Message Text but not the name of the column.
Debugging the code I found that If I catch the event, the parameter er_Data_Changed (the class CL_ALV_CHANGED_DATA_PROTOCOL) is filled with some other informations like Modified Rows and other attributes like FieldCatalog, Row-ID, so I thought the problem was related to that, and that's why I replicated the whole case in my processing, filling every table I would see if I use the "standard way" for validation. Bu it didn't correct the error. I still don't see the name of the Column.
This is my code, it's only the part interested, If you need other informations, please ask me and I will copy them.
form CHECK_ALV_0200_0110 Changing pc_Error Type Char01.
Data: lt_MatchK1 Type tp_Matches1_Key_t,
        l_Message Type Char100,
        l_MessX    Type String,
        l_QtaRes   Type ZDM_AMT_ASSIGNED,
        l_QtaAcc   Type ZDM_AMT_ACCRUED,
        l_QtaStep Type ZDM_AMT_ASSIGNED.
Field-Symbols: <fs_Table>    Type Standard Table,
                 <fs_Master>   Type Standard Table,
                 <fs_Mod_Cell> Type LVC_S_MODI,
                 <fs_Line>     Type Any,
                 <fs_Field>    Type Any,
                 <fs_Any>      Type Any.
Data lt_Matches_Alv_Mod Type tp_Matches1_Alv_t.
Data ls_Modi Type LVC_S_MODI.
Data: l_Row_ID Type I,
        l_Tabix Type I.
Field-Symbols: <fs_Match_ALV> Type tp_Matches1_Alv_s.
Free go_Error.
CREATE OBJECT go_Error
    EXPORTING
*      i_container =
      i_calling_alv = go_0200_Alv
* Validation Checks
Clear pc_Error.
Clear ls_Modi.
Loop At gt_Matches1_Alv Assigning <fs_Match_ALV>.
    l_Tabix = Sy-Tabix.
    Check <fs_Match_ALV>-Status Eq con_Status_Temp.
*   Set the Modified Row for the CL_ALV_CHANGED_DATA_PROTOCOL object
      Append <fs_Match_ALV> To lt_Matches_Alv_Mod.
      Add 1 To ls_Modi-Row_Id.
      ls_Modi-FieldName = 'AMT_DEDUCTED'.
      Write <fs_Match_ALV>-Amt_Deducted To ls_Modi-Value Currency <fs_Match_ALV>-Waers.
      Condense ls_Modi-Value No-Gaps.
      ls_Modi-Tabix = l_Tabix.
      Append ls_Modi To: go_Error->mt_Mod_Cells,
                         go_Error->mt_Good_Cells.
      l_Row_ID = ls_Modi-Row_Id.
    Clear l_Message.
    If <fs_Match_ALV>-Amt_Deducted Eq 0.
      pc_Error = con_X.
      CALL METHOD go_Error->Add_Protocol_Entry
        EXPORTING
          i_msgid     = 'ZDMV'
          i_msgty     = 'E'
          i_msgno     = '005'
*          i_msgv1     =
*          i_msgv2     =
*          i_msgv3     =
*          i_msgv4     =
          i_fieldname = 'AMT_DEDUCTED'
          i_row_id    = l_Row_ID
*          i_tabix     =
      Continue.
    EndIf.
    Case g_Dynnr.
      When '0110'.
        Perform Get_ResQtaDispute1 Using lt_MatchK1
                                         <fs_Match_ALV>
                                   Changing l_QtaRes.
        Perform Get_ResQtaAccrued1 Using <fs_Match_ALV>
                                   Changing l_QtaAcc.
*      When '0111'.
*        Perform Get_ResQtaDispute2 Using lt_MatchK2
*                                         <fs_Match_ALV>
*                                   Changing l_QtaRes.
*        Perform Get_ResQtaAccrued2 Using <fs_Match_ALV>
*                                   Changing l_QtaAcc.
    EndCase.
    Add <fs_Match_ALV>-Amt_Deducted To l_QtaStep.
    If l_QtaStep > l_QtaRes.
*     Store the Error
      pc_Error = con_X.
      Write l_QtaRes To l_Message Currency <fs_Match_ALV>-Waers.
      Condense l_Message No-Gaps.
      CALL METHOD go_Error->Add_Protocol_Entry
        EXPORTING
          i_msgid     = 'ZDMV'
          i_msgty     = 'E'
          i_msgno     = '002'
          i_msgv1     = l_Message
*          i_msgv2     =
*          i_msgv3     =
*          i_msgv4     =
          i_fieldname = 'AMT_DEDUCTED'
          i_row_id    = l_Row_ID
*          i_tabix     =
    EndIf.
    If l_QtaStep > l_QtaAcc.
*     Store the Error
      pc_Error = con_X.
      Write l_QtaAcc To l_Message Currency <fs_Match_ALV>-Waers.
      Condense l_Message No-Gaps.
      CALL METHOD go_Error->Add_Protocol_Entry
        EXPORTING
          i_msgid     = 'ZDMV'
          i_msgty     = 'E'
          i_msgno     = '002'
          i_msgv1     = l_Message
*          i_msgv2     =
*          i_msgv3     =
*          i_msgv4     =
          i_fieldname = 'AMT_DEDUCTED'
          i_row_id    = l_Row_ID
*          i_tabix     =
    EndIf.
EndLoop.
If pc_Error Eq con_X.
*   If there was at least one error, Display the Popup
    go_Error->mt_FieldCatalog[]   = gt_0200_FCat[].
    go_Error->ms_Layout-Zebra     = con_X.
    Get Reference Of lt_Matches_Alv_Mod[] Into go_Error->Mp_Mod_Rows.
    CALL METHOD go_error->display_protocol
*      EXPORTING
*        i_container        =
*        i_display_toolbar =
*        i_optimize_columns =
EndIf.
EndForm.
Do you know if there is a particular issue about that? Or, maybe, I'm doing something wrong...
Please help me
Regards,
Claudio
Edited by: Claudio Distrutti on Oct 31, 2008 12:38 PM

Hello Claudio
Nobody prevents you from calling your event handler method go_grid->HANDLE_DATA_CHANGED directly!
What do I mean with that?
I assume you are calling method go_grid->CHECK_CHANGED_DATA at the beginning of the PAI module to catch any changes from the editable ALV grid. Within the event handler method you do your validation and send the error popup if necessary.
Now when the user closes the error popup and pushes e.g. the SAVE button then I can happen that method HANDLE_DATA_CHANGED does not trigger event DATA_CHANGED because nothing was indeed changed on the ALV grid. Yet the invalid value is still there.
However within the FORM routine for saving the data you can just call your event handler method directly:
FORM save_data.
CALL METHOD go_grid->handle_data_changed
    EXPORTING
*      er_data_changed =
      e_ucomm = 'SAVE'.
ENDFORM.
Now within your event handler method you always know when the method was called because if method CHECK_CHANGED_DATA triggers event DATA_CHANGED the IMPORTING parameter ER_DATA_CHANGED is bound whereas it is empty when the method is called from your SAVE routine.
METHOD handle_data_changed.
DATA: lo_log   TYPE REF TO CL_ALV_CHANGED_DATA_PROTOCOL.
    IF ( er_data_changed IS BOUND ).
      lo_log = er_data_changed.
    ELSE.
      CREATE OBJECT lo_log.
    ENDIF.
" Do the validations and send error log if necessary
lo_log->DISPLAY_PROTOCOL( ).
ENDMETHOD.
Regards
Uwe

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