HIde columnns in POWL ALV display but download them in excel

Hi Webdynpro experts,
We are using Personal Worklist (POWL) for generating online reports. There is new requirement from our customer.
The customer does not want all the contents to be seen in the Report output. but they need these to be downloaded to excel on click of Export to Excel. We can hide fields by adjusting visible property in field catalog but then these fields doesn't get downloaded to excel. how to solve this? 
Thanks in advance,
Sachin

Hi Mahender,
you can do it by making the columns conditional. Edit the IR report attribute and in the Conditional Display section add a condition type Request = Expression 1 and in Expression 1 enter CSV .
I have created a report on emp table and made Mgr and hire date column conditional on request = CSV
http://apex.oracle.com/pls/otn/f?p=50942:64
Thanks,
Manish

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      CLEAR lv_fldcat.
      lv_fldcat-row_pos   = '1'.
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      lv_fldcat-fieldname = 'ZEITB'.
      lv_fldcat-tabname   = 'IT_OUTPUT'.
      lv_fldcat-outputlen = 5.
      lv_fldcat-scrtext_m = 'Time constraint'.
      lv_fldcat-edit = 'X'.
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      lv_fldcat-f4availabl = 'X'.
      lv_fldcat-ref_table = 'T582A'.
      lv_fldcat-ref_field = 'ZEITB'.
      APPEND lv_fldcat TO it_fcat.
      CLEAR lv_fldcat.
      lv_fldcat-row_pos   = '1'.
      lv_fldcat-col_pos   = '7'.
      lv_fldcat-fieldname = 'DNAME'.
      lv_fldcat-tabname   = 'IT_OUTPUT'.
      lv_fldcat-outputlen = 15.
      lv_fldcat-scrtext_m = 'Dialogmodule'.
      lv_fldcat-icon = ''.
      APPEND lv_fldcat TO it_fcat.
      CLEAR lv_fldcat.
      lv_fldcat-row_pos   = '1'.
      lv_fldcat-col_pos   = '8'.
      lv_fldcat-fieldname = 'DAVO'.
      lv_fldcat-tabname   = 'IT_OUTPUT'.
      lv_fldcat-outputlen = 15.
      lv_fldcat-scrtext_m = 'Start'.
      lv_fldcat-edit = 'X'.
      APPEND lv_fldcat TO it_fcat.
      CLEAR lv_fldcat.
      lv_fldcat-row_pos   = '1'.
      lv_fldcat-col_pos   = '9'.
      lv_fldcat-fieldname = 'DAVOE'.
      lv_fldcat-tabname   = 'IT_OUTPUT'.
      lv_fldcat-outputlen = 15.
      lv_fldcat-scrtext_m = 'End'.
      lv_fldcat-icon = ''.
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      CLEAR lv_fldcat.
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      ty_dropdown-handle = '1'.
      ty_dropdown-value = ' '.
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      ty_dropdown-handle = '1'.
      ty_dropdown-value = '1'.
      APPEND ty_dropdown TO it_dropdown.
      ty_dropdown-handle = '1'.
      ty_dropdown-value = '2'.
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      ty_dropdown-handle = '1'.
      ty_dropdown-value = '3'.
      APPEND ty_dropdown TO it_dropdown.
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          it_drop_down = it_dropdown.
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          WHEN 'DAVO'.
            lv_fldcat-drdn_hndl = '1'.
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            MODIFY it_fcat FROM lv_fldcat.
        ENDCASE.
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          text
         <--P_IT_LAYOUT  text
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      it_layout-cwidth_opt = 'X'.
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      it_layout-zebra = 'X'.
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    MODULE pai INPUT.
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    *And only values in the dropdown or in the default
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      c_alvgd->check_changed_data( ).
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              titlebar       = 'SAVING DATA'
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              answer         = gstring
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              text_not_found = 1
              OTHERS         = 2.
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          LEAVE PROGRAM.
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      CLEAR: ok_code.
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    -->  p1        text
    <--  p2        text
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          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.
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    Hi,
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    Hi ,
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