These warning messages can be due to the following:
1. The Business Application Session ID (Administration/Business Applications/Session Identification tab) is not unique for the monitored application. Selecting a good session identifier for the life of the transaction can eliminate this message as well as the "unidentified user" issue.
2. The Business Application Session Timeout (Administration/Business Applications/General tab) has a different value to the session timeout defined for the monitored application on its web server.
3. Duplicate monitoring of traffic due to having multiple TIMs receiving the same traffic. If it is not possible to split the traffic to the TIMs, this can be controlled on each TIM by adding Web Server Filters under the Setup.