No functional module exist error in smartforms

Hi to all experts,

getting an error that no function module exist for the smartforms. i have checked the smartform function module exist in se37. what could be the possible reasons for this error .

here is my code

DATA: fm_name TYPE RS38L_FNAM.

CALL FUNCTION 'SSF_FUNCTION_MODULE_NAME'
  EXPORTING
    formname                 = 'ZM_MM_PHYINVBC_SMARTFORM'

 IMPORTING
   FM_NAME                  = fm_name
 EXCEPTIONS
   NO_FORM                  = 1
   NO_FUNCTION_MODULE       = 2
   OTHERS                   = 3
          .
IF sy-subrc = 0.
CALL FUNCTION fm_name
* EXPORTING
*   ARCHIVE_INDEX              =
*   ARCHIVE_INDEX_TAB          =
*   ARCHIVE_PARAMETERS         =
*   CONTROL_PARAMETERS         =
*   MAIL_APPL_OBJ              =
*   MAIL_RECIPIENT             =
*   MAIL_SENDER                =
*   OUTPUT_OPTIONS             =
*   USER_SETTINGS              = 'X'
* IMPORTING
*   DOCUMENT_OUTPUT_INFO       =
*   JOB_OUTPUT_INFO            =
*   JOB_OUTPUT_OPTIONS         =
  TABLES
    it_final                   = ziseg[]
 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.