Save a variant in a custom module-pool.

Hi all,
i hope there is someone that can help me.
My problem is: i've to save a variant in a module-pool custom SAPMZ...ecc.
Is there a function module or a routine or some specific ABAP istruction to save a variant?
I ask this because in my custom module-pool i've insert input field in main dynpro.
Thanks a lot,
regards,
Alex.

Please use below code it works for me:
What I did was copy the function group SVAR. When it asked what function module to copy just select
'RS_VARIANT_SAVE_FROM_SELSCREEN' and renamed it to 'ZS_VARIANT_SAVE_FROM_SELSCR'.
DATA: lv_screen LIKE sy-dynnr.
CLEAR: t_rkey, t_screen.
REFRESH: t_rkey, t_screen.
t_rkey-report = sy-repid.
APPEND t_rkey.
t_screen-program   = sy-repid.
t_screen-dynnr     = '0101'.
t_screen-type      = 4.
APPEND t_screen.
lv_screen = '0101'.
EXPORT lv_screen TO MEMORY ID 'MZ_COMISSION_REPORT_F02_SCREEN'.
CALL FUNCTION 'ZS_VARIANT_SAVE_FROM_SELSCR'
    EXPORTING
      curr_report          = sy-repid
      vari_report          = sy-repid
    IMPORTING
      variant              = w_variant
    TABLES
       p_screens           = t_screen
     p_sscr               = t_selctab
     p_vari               = t_vari
    EXCEPTIONS
      illegal_variant_name = 1
      not_authorized       = 2
      no_report            = 3
      report_not_existent = 4
      report_not_supplied = 5
      OTHERS               = 6.
t_rkey-variant = w_variant.
MODIFY t_rkey INDEX 1.
CALL FUNCTION 'RS_RWSET_SAVE_VARIANT'
    EXPORTING
      rkey    = t_rkey
    TABLES
      selctab = t_selctab.
Then in program LZSVARF07 function save_as_variant find where it's transfering the screen.
READ TABLE variscreens WITH KEY dynnr = sy-dynnr.
IF sy-subrc NE 0.
    IMPORT lv_screen FROM MEMORY ID 'MZ_COMISSION_REPORT_F02_SCREEN'.
    IF lv_screen IS INITIAL.
      variscreens-dynnr = sy-dynnr.
    ENDIF.
ENDIF.
PERFORM fill_varidyn TABLES p_dynsfields
                       USING $rkey space. "Kein import von DYNSFIELDS
Good luck!
Edited by: Alex Nguyen on May 2, 2009 1:36 AM
Edited by: Alex Nguyen on May 5, 2009 5:26 PM

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