High Availability Guide : Using HotStandby with applications : Transparent Connectivity : Handling TC Info contradictions
  
Handling TC Info contradictions
The attributes of the TC Info may contradict the actual service made available. In those situations, the connection is granted, but the SUCCESS_WITH_INFO warning is issued.
This is done in the following cases:
PREFERRED_ACCESS is specified, but HSB is not enabled. Basic connectivity is enabled.
TF_LEVEL is specified, but HSB is not enabled. Basic connectivity is enabled.
See also
Transparent Connectivity