Entitlement Management - User alert settings, unable to change acknowledgement

Has anyone tried applying 'User Alerts' within the Entitlement Management

Entitlement Management - User alert settings, unable to change acknowledgement.

I can apply a restriction, I tested setting the threshold to a count of 1, I wanted to check I was receiving the alert as an administrator

However I cannot change the user message to none, if I go to the pulldown nothing happens

Cheers

Chris