When you create the form by SMARTFORMS, system will automatically create the function module for called by ABAP/4. You can get this function module by apply function module "SSF_FUNCTION_MODULE_NAME" and send the form name. This function will return the function name for call SMARTFORMS that you created.

Example

DATA: smf_name TYPE TDSFNAME VALUE ’ZSMARTFORM01’,
      fn_name TYPE RS38L_FNAM.
CALL FUNCTION ’SSF_FUNCTION_MODULE_NAME’
  EXPORTING
    FORMNAME = smf_name
  IMPORTING
    FM_NAME  = fn_name.
CALL FUNCTION fn_name
  EXPORTING
    WA       = wa_doc.