service messages

Hi all, Is the v2 functionality of service_messages etc (under the logging bit of radiusd.conf) in v3? I'd like to configure some standard error messages to be in one place and refer to them in policies etc without having to dig out where they are at.. Something like service_messages { # invalid mac address mac_address_incorrect = "the mac address format is invalid" } Then in policies etc Reply-Message := "${service_messages.mac_address_incorrect}" That sort of thing. Am I missing some obvious documentation somewhere? Apologies if so. Thanks Andy