ABAP - Function Module For Calling Smartforms.

You should use 'SSF_FUNCTION_MODULE_NAME' & call function fm_name in your program & not others.

*&---------------------------------------------------------------------*
*& Report ZTACA_DRIVER_SMARTFORM *
*& *
*&---------------------------------------------------------------------*
*& *
*& *
*&---------------------------------------------------------------------*

REPORT ZTACA_DRIVER_SMARTFORM .

Tables : sflight.
Data : fm_name TYPE rs38l_fnam.

*data : Begin of it_flttab occurs 0,
* carrid type sflight-carrid,
* connid type sflight-connid,
* fldate type sflight-fldate,
* seatsmax type sflight-seatsmax,
* seatsocc type sflight-seatsocc,
* End of it_flttab.

data : it_flttab like table of sflight.
Data : g_salary type i .
* it_flttab type standard table of ty_flt.
g_salary = 1000.


select carrid connid fldate seatsmax seatsocc from sflight into
corresponding fields of table it_flttab.

CALL FUNCTION 'SSF_FUNCTION_MODULE_NAME'
EXPORTING
formname = 'ZTACA_SMFORM2'
* VARIANT = ' '
* DIRECT_CALL = ' '
IMPORTING
FM_NAME = fm_name
EXCEPTIONS
NO_FORM = 1
NO_FUNCTION_MODULE = 2
OTHERS = 3
.
IF sy-subrc <> 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.

call function fm_name
Exporting
salary = g_salary
TABLES
it_flttab = it_flttab
EXCEPTIONS
FORMATTING_ERROR = 1
INTERNAL_ERROR = 2
SEND_ERROR = 3
USER_CANCELED = 4
OTHERS = 5 .

IF SY-SUBRC <> 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.