Disable an account automatically

Hi everybody,

I think I misunderstood something about disabling an account automatically.

I retrieve datetime attribute from HCM system and set up MX_VALIDTO attribute (MX_PERSON entrytype). I believed that when the MX_VALIDTO is reached, some how MX_DISABLE is assigned to the user and  task to disable the account is triggered. But nothnig happens in my case.

I must be missing something..

Do I have to make a script to trigger a custom task that assign MX_DISABLE to the account?

Thanks

Guillaume