Customice logging fault message

Summary

Customice logging fault message

Content

Hello, we want to active unique session in our customer portal but before that we need to customice the logging fault message to distinguish between  user/password error to unique session error. In core is the same message:

$result['message'] = (Config::getConfig(CP_MAX_LOGINS) || Config::getConfig(CP_MAX_LOGINS_PER_CONTACT))
                ? Config::getMessage(USRNAME_PASSWD_ENTERED_INCOR_ACCT_MSG)
                : Config::getMessage(USERNAME_PASSWD_ENTERED_INCOR_ACCT_MSG);
   

Does anyone know how to achieve that? We have tried to expand the oob Contact model, but in the call to some out-of-the-box APIs it returns an access error.