I must ask: did you or did you not also disable the Log option ? If not, you'll get messages - with slightly different wording - in the AP log, although they are for information only.
If you have added exceptions to the rule no message should come afterwards. Maybe you did add exception within an ePO policy but that has not yet been, or cannot be, enforced on the client. Please check if the exception has appeared in the respective VirusScan registry key (Behaviourblocking) on the client.
The Logging Option is disabled too. The problem seems to be that the policy is not enforced on the clients! I will search in this direction.