Regarding Customer Exit in Bex

Question

Hello Expers.
Here is my scenario: I have variable which accepts the key date from the user. The requirement is to get the calmonth from the date entered by the user. According to my point of view, Writing customer exit is a best option but i do not know is it possible for me to pass the date, entered by the user, to exit? If Yes than please let me know how?
Help required Urgently

Answer 1

use the parameter I_STEP which specifies when the enhancement is called.
The following values are valid for I_STEP:
·        I_STEP = 1
Call takes place directly before variable entry
·        I_STEP = 2
Call takes place directly after variable entry. This step is only started up when the same variable is not input ready and could not be filled at I_STEP=1.
·        I_STEP = 3
In this call, you can check the values of the variables. Triggering an exception (RAISE) causes the variable screen to appear once more. Afterwards, I_STEP=2 is also called again.
·        I_STEP = 0
The enhancement is not called from the variable screen. The call can come from the authorization check or from the Monitor.
sample code : user enter value of date in say variable ZDATE
l_s_range TYPE rsr_s_rangesid,
l_t_var_range TYPE rsr0_s_var_range.
WHEN 'ZCALM' .
if i_step=2.
read table i_t_var_range into l_t_var_range with key vnam = 'ZDATE' .
if sy-subrc = 0.
l_s_range-low = l_t_var_range+0(6).
l_s_range-high = l_t_var_range+0(6).
l_s_range-opt = 'EQ'.
l_s_range-sign = 'I'.
append l_s_range to e_t_range.
endif.
endif.