*****Necesitas definir estas Variables para Impresion.
DATA: w_ssfcompop TYPE ssfcompop.
DATA: w_ssfctrlop LIKE ssfctrlop.

DATA: w_sform LIKE tnapr-sform.
DATA: w_fm_name TYPE rs38l_fnam.


* Control parameters
  w_ssfctrlop-no_dialog = ' '.
  w_ssfctrlop-langu = sy-langu.

  w_ssfcompop-tdtitle = 'Printing Forms Miscelanous'(t01).
  w_ssfcompop-tddest = 'HPSAP'.
  w_ssfcompop-tdimmed = 'X'.
  w_ssfcompop-tddelete = 'X'.
  w_ssfcompop-tdlifetime = '1'.
  w_ssfcompop-tdnoprev = ' '.


  w_sform = 'Z_AQUI_EL_NOMBRE_DEL_SMARTFORM'.

    CALL FUNCTION 'SSF_FUNCTION_MODULE_NAME' " <---esta es la función que llama el SMARTFORM
      EXPORTING
        formname           = w_sform
      IMPORTING
        fm_name            = w_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.