F4 search help manually called from report selection screen

**************************************************************
*Call search help.
DATA: return_tab type STANDARD TABLE OF DDSHRETVAL.

PARAMETERS p_test(10) type c.

************************************************
*AT SELECTION-SCREEN
AT SELECTION-SCREEN on VALUE-REQUEST FOR p_test.

  CALL FUNCTION 'F4IF_FIELD_VALUE_REQUEST'
    EXPORTING
      TABNAME           = 'T161'    "mandatory - dictionary table type
      FIELDNAME         = 'BSART'   "mandatory - dictionary field type
      SEARCHHELP        = 'H_T161'  "shelp
      SHLPPARAM         = 'BSART'   "field value to return from shelp
    TABLES
      RETURN_TAB        = return_tab
    EXCEPTIONS
      FIELD_NOT_FOUND   = 1
      NO_HELP_FOR_FIELD = 2
      INCONSISTENT_HELP = 3
      NO_VALUES_FOUND   = 4
      OTHERS            = 5.