System log for user type change

Hi All

We have a requirement to set CCMS alerts for user type change in SAP. We have already enabled security audit log to capture the same. But we need to set alert as well. But when a user's type is changes in SU01; it does not create any log in SM21 or RZ20 which we can capture in alert. Could you please help if there is any system log number of user type change. Like we have EB U for incorrect user type and AU for user locking etc.

Thanks

Varun