How to write customer exit for the variable

Question

Hi Experts,
I have a requirement to create the variable, the scenaria is like this..
I need to create the variable which gives the period/year values,if yours enters the values 05.2007 then the variable should return the first monthe the year i.e.01.2007.
I hope it can be done by writing the customer exit..but iam unware how to achieve this.
Please explain me step by step and cope for customer exit to done this.
Points will be awarded
Suraj.

Answer 1

hi Suraj,
there should variable sap exit for first month,
for customer exit, check this how to doc for steps
https://websmp210.sap-ag.de/~sapdownload/011000358700002762582003E/HowToDeriveVariableValue.pdf
your code may look like
  INCLUDE ZXRSRU01                                                   *
  DATA: L_S_RANGE TYPE RSR_S_RANGESID.
  DATA: LOC_VAR_RANGE LIKE RRRANGEEXIT.
  CASE I_VNAM.
  WHEN 'your 1st month variable'.
    IF I_STEP = 2.                                  "after the popup
      LOOP AT I_T_VAR_RANGE INTO LOC_VAR_RANGE
              WHERE VNAM = 'your user input variable'.
        CLEAR L_S_RANGE.
        L_S_RANGE-LOW      = LOC_VAR_RANGE-LOW(4)."low value, e.g.200001
        L_S_RANGE-LOW+4(2) = '01'.
        L_S_RANGE-SIGN     = 'I'.
        L_S_RANGE-OPT      = 'EQ'.
        APPEND L_S_RANGE TO E_T_RANGE.
        EXIT.
      ENDLOOP.
    ENDIF.
  ENDCASE.
hope this helps.