Answer / prashant tiwari

There are two ABAP statements for raising exceptions. They
can only be used in function modules:

RAISE <except>.

and

MESSAGE..... RAISING <except>.

The effect of these statements depends on whether the
calling program handles the exception or not. If the name
<except> of the exception or OTHERS occurs in the
EXCEPTIONS addition of the CALL FUNCTION statement, the
exception is handled by the calling program.

If the calling program does not handle the exception

The RAISE statement terminates the program and switches to
debugging mode.
The MESSAGE ..... RAISING statement display the specified
message. How the processing continues depends on the
message type.
If the calling program handles the exception, both
statements return control to the program. No values are
transferred. The MESSAGE ..... RAISING statement does not
display a message. Instead, it fills the system fields SY-
MSGID, SY-MSGTY, SY-MSGNO, and SY-MSGV1 to SY-MSGV4.

Answer / shankar

1-System_Failure
2-Communication-failure

Thru this we can raise an exception..

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