Simple question about data selection in a query

Hi everybody,
I've got the requirement to change an existing query with the query designer. It be possible to display data (i.e. sales) just for the last 3 month (actual month minus 3). What is the best approach? A colleague advised me to do with a variable customer exit?!
Is this the best approach or is there an easier way?
Thanks!
Best regards,
Daniel

Thanks for your answers.
Im pretty new to that query stuff
Well I wrote the following ABAP Code:
CASE i_vnam.
     WHEN 'name'.
          IF i_step = 1.
               DATA: lv_date TYPE SY-DATUM.
               lv_date = SY-DATUM.
               lv_date+6(2) = '01'.
               lv_date+4(2) = lv_date+4(2) - 3.
               CLEAR l_s_range.
               CONCATENATE lv_date(4) '0' lv_date+4(2) into l_s_range-low.
               l_s_range-opt = 'GE'.
               l_s_range-sign = 'I'.
               APPEND l_s_range to e_t_range.
          ENDIF.
ENDCASE.
But with your suggestion this coding is probably not necessary?

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Simple question about data selection in a query

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