Rule editor question - how to assign response class and value?

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My custom Business Operation typically creates a Ens.StringResponse with StringValue which is sent back to my custom Business Service.  Is there a way I can use the assign, or some way, in Rule Editor in a Business Process (EnsLib.MsgRouter.RoutingEngine) so that it can send back a Ens.StringResponse with a StringValue to the Business Service when not routing the message to any operation?