How to save Checkbox inputs as a Variants in WD ABAP

Hi,
I am going through this nice blog [http://www.sdn.sap.com/irj/scn/weblogs;jsessionid=(J2EE3414700)ID0832150950DB20043138143752756391End?blog=/pub/wlg/10731] which helped me creating varaint options for SELECT -optins fields.
Everything works fine..
Now I want to save some selection screen Check boxes , plus input fields in to this.
I have NODE called ATTR in which I have checkboxes attributes like ATT1,ATT2,ATT3 etc..
So what I was trying to pass the checkbox values by reading and then assigning it to lv_att1 but it says i cannot change value..
where am i going wrong?
method HANDLEFROM_SAVEVARIANT .
DATA lo_nd_attr TYPE REF TO if_wd_context_node.
DATA lo_el_attr TYPE REF TO if_wd_context_element.
DATA ls_attr TYPE wd_this->element_attr.
DATA lv_att1 LIKE ls_attr-att1.
** navigate from <CONTEXT> to <ATTR> via lead selection
lo_nd_attr = wd_context->get_child_node( name = wd_this->wdctx_attr ).
* get element via lead selection
lo_el_attr = lo_nd_attr->get_element( ).
* get single attribute
lo_el_attr->get_attribute(
    EXPORTING
      name = `ATT1`
    IMPORTING
      value = lv_att1 ).
wd_this->lt_att1 = lv_att1.
wd_this->lt_range_table = lt_range_table .
wd_this->M_HANDLER->SET_RANGE_TABLE_OF_SEL_FIELD(
             exporting I_ID = 'PS_PSPID'
                       IT_RANGE_TABLE = lt_range_table ).
I

Hi iam a starter in ABAP and i got a small error while coding that is
PARAMETERS:
ABAP AS CHECKBOX.
SELECTION-SCREEN COMMENT 5(4) text-010.
SELECTION-SCREEN END OF LINE.
SELECTION-SCREEN BEGIN OF LINE.
PARAMETERS:
MM AS CHECKBOX.
SELECTION-SCREEN COMMENT 5(4) text-011.
SELECTION-SCREEN END OF LINE.
selection-screen end of block nam1.
if ABAP = 'X'.
WRITE ' YOU ARE ELIGIBLE CONSULTANT'.
ENDIF.
in the above code my requirement is when i check the abap the following msg must be showed in the output screen but its not showing..
please help me if anyone knows how to do it. thank you.
And this is the part of the code if anyone want to see whole code it is attached with this thread.

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Hi everybody how to save the inputed data in one simple list output .

here am wrting the description of the requirement ...
am displaying one report output in that output i have all my fields open so that user can directly chage the dats what ever needed or he needs.
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hiiii
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/people/sharad.agrawal/blog/2008/08/25/creating-and-using-variant-in-select-options-with-web-dynpro-for-abap-2
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Hi,
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