How to disply error messages if values not available fpr F4 help

Question

Hi,
I have implemented F4 help for a selection screen field using function module.
I want to throw a customized error message if no value is available.
In my case if no value is available it gives standard message no value available.
I have tried but it gives a dump.
Please suggest.
Thanks and Regards
Shraddha

Answer 1

for F4 help defenitely you will be having a select query to populate into internal table
if it is so
after the select query with sy-subrc check
if yes
then it will proceed with the function module
if no then throw error message
message
use this code
form f_f4help .
  data : begin of it_itab occurs 1,
           username type usr02-bname,
           end of it_itab.
  select bname from usr02 into table it_itab.
if sy-subrc = 0
  call function 'F4IF_INT_TABLE_VALUE_REQUEST'
    exporting
      retfield        = 'BNAME'
      dynpprog        = sy-repid
      dynpnr          = sy-dynnr
      dynprofield     = 'P_USER'
      value_org       = 'S'
    tables
      value_tab       = it_itab[]
    exceptions
      parameter_error = 1
      no_values_found = 2
      others          = 3.
  if sy-subrc  ne 0.
*   MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
*           WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
  endif.
else.
message with error.
endif.
endform.
   cheers
s.janagar