Displaying Error Messages in a variant FM (Object Dependency)

Question

Hi Guru's,
I've developed a variant Function Module (FM) for validating the characteristics of a material.
In the validation, if the condition doesn't satisfied, i need to through error message.
In the variant FM, under the exceptions tab., always 2 parameters we should declare like following..
1 FAIL
2.Internal_Erro
I'm using the following syntax for throwing the error message.
MESSAGE EXXX(MSG_CLASS) RAISING FAIL.
With the above syntax i'm not able to get the error message at all??
If i use the normal syntax like MESSAGE EXXX(MSG_CLASS), it is causing me other problems???
Could you please let me know how to display the error messages in Variant FM????
Thanks for the Help in advance..
Thanks,
Adi.

Answer 1

Usually in a function module, where you write source code, the line where you want to raise an exception ..you can raise exception this way
RAISE FAIL.
  or 
RAISE Internal_Erro.
In the program/report where you call your function module, you can get the exception using sy-subrc and display your custom message as
CALL FUNCTION <FM>
* EXPORTING
* IMPORTING
EXCEPTIONS
   FAIL                        = 1
   Internal_Erro          = 2
IF SY-SUBRC <> 0.
  if sy-subrc = 1.  " Exception - FAIL
    MESSAGE EXXX(MSG_CLASS).
  elseif sy-subrc = 2. "Exception - Internal_Erro
    MESSAGE EXXX(MSG_CLASS).
  endif.
ENDIF.