There is an issue with implementing this request. When you select a "Round Trip" event, it creates a "Request and Wait for Reply" and the Broadcast. The Broadcast uses as arguments the Reply. The Broadcast is called whether the wait for Reply is true or not.
Let's see what others have to say, but I am feeling inclined at the moment to decline this request.
When you add a new Request and wait for reply event, the scripting tool adds automatically, in the Modules consumer, the handler case. In this case, there is also added the bundle for the Reply message and the Wait for reply? case structure.
Personally, i move every time the bundle inside the Wait for reply? case structure to have a cleaner area.
The scripting tool can add this automatically for a cleaner view and maybe an optimized code. There is no need to create a bundle, if you do not use it forward.