ABAP-User Exit CONFPP05 (T-code co11n) ---- Duprec exception

Question

I'm currently working on user exit CONFPP05 (T-code co11n)
I'm trying to validate shift hour not more than 8 hours.
total_jam = v_iserh + v_ism01 + v_ism02 + v_ism04 + afrud_tab-ism01 + afrud_tab-ism02 + afrud_tab-ism04.
IF total_jam > 8.
   MESSAGE 'Jam Total Shift > 8 !!!' TYPE 'E'.
ENDIF
and I'm facing a problem, when i give error message with type E.
When the program execute that error, the program succesfully run the error message, buat after that, when I press ENTER or SAVE button, it give me runtime error
here I catch some error
"Exception condition "DUPREC" raised."
Error analysis A RAISE statement in the program "SAPLCORB" raised the exception condition "DUPREC". Since the exception was not intercepted by a superior program, processing was terminated.
Short description of exception condition:
For detailed documentation of the exception condition, use
Transaction SE37 (Function Library). You can take the called
function module from the display of active calls.
Trigger Location of Runtime Error
Program                                 SAPLCORB
Include                                 LCORBU08
Row                                     100
Module type                             (FUNCTION)
Module Name                             CO_RU_DI_AFRU_INSERT
How can I deal with this problem?

Answer 1

Hi
Keshav is right. To display the messages see SAP Note 406633 - No information messages from customer exit. For further information see SAP Note 367489 - Customer exits of confirmation.
Regards
Eduardo