Bex query that returns variable number of columns based upon variable value

I have a request to create a query that, at excution time, has a variable for 'nbr of months', and based on the value entered by the user, returns data for only the specified number of months. Value that can be entered can vary from 1 to 12. A simple example is, if the user enters 1, then they would only want to see one column, and if they entered 6, then they'd like to see 6 columns in the workbook.  All suggestions on how to implement this dynamic columns on a workbook will be appreciated.
Thanks.
BN

Hi,
Do this->
1) first create a New Structure in Rows-> Place your New Selection and drag your KF.
2) Nw Create a New Formual under this structure. Now Create a Formula variable ( "ZFVXXX")with user-entry and ready for input and dimension as NUmber. and place in formula area. And hide this formula.
3)Now Create a New Customer-Exit variable on 0CALMONTH name as "ZCECMON" with following atrribute->Mandatory, Range(Interval) and remove check for Ready for entry.
4)Drag your 0CALMONTH in Rows above That Structure and restrict it to "ZCECMON".
5) Now go to CMOD and write this code.
INCLUDE ZXRSRU01 *
DATA: L_S_RANGE TYPE RSR_S_RANGESID. 'In global area
DATA: LOC_VAR_RANGE LIKE RRRANGEEXIT. 'In global area
DATA: zmonth like /bi0/0calmonth.
CASE I_VNAM.
WHEN 'ZCECMON'.
IF i_step = 2.
LOOP AT I_T_VAR_RANGE INTO LOC_VAR_RANGE
WHERE VNAM = 'ZFVXXX'.
zyear = sy-datum(4).
zmonth = sy-datum+4(2).
l_s_range-low = zmonth.
zmonth = zmonth + loc_var_range-low.
l_s_range-HIgh = zmonth.
l_s_range-sign = 'I'.
l_s_range-opt = 'BT'.
APPEND l_s_range TO e_t_range.
ENDIF.
ENDCASE.
6) activate the porject and go to rsrt and run there first.
Regards,
San!
Message was edited by: San!

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    PERIOD1       1222.23                           2423.2     232.33     345.21                       
    PERIOD2                                                                                            
    PERIOD3                                                                                            
    PERIOD4                                                                                            
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    Hi,
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    I changed in this way:
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    Dear Friends,
    Greetings to you all!
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    I have a BPEL process that is pulling data from some Database tables everything is working fine.
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    However i'd like to run the above query as one statement, rather than 3 separate queries.
    I've googled the fucntion for examples where it returns a nodelist or XML snippet, but to no avail.
    I've tried it before and couldn't get it to work.
    Does anyone have any examples.
    Thanks in advance.
    Stuart

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