Since the Enterprise Streets is defined in the database as a PUBLIC WORKS type system, you have to have that type of service turned on to get the scanner to scan that entry. You probably already have already have Law Dispatch, Fire Dispatch, and EMS Dispatch turned on, By default, Public Works is not turned on.
Since you manually entered the Enterprise Streets, you should be able to change it's Service Type to Law Dispatch if that is easier than turning on Public Works. Turning on Public Works might get other things being scanned you don't want to listen to.