[SQL] Oracle ORA-21000 "error number argument to raise_application_error of X is out of range"

Oracle allows us to raise user defined exceptions from PL/SQL code with RAISE_APPLICATION_ERROR.

The most common usage is:

RAISE_APPLICATION_ERROR(code, message)

Where code is an integer and message a string. Now, when the exception occurs, the user will see ORA-code: message.

Sometimes you may get the ORA-21000: error number argument to raise_application_error of X is out of range error. This happens because, for user defined errors, the error code (first argument) MUST be between -20000 and -20999 included.