Grouping messages inside a communication diagram

[Eiberle]

Hello to all,

I  have a little problem using the communication diagram (EA8 Build 856).

If I linked two objects (say object A and object B) inside the communication diagram it is possible to let send object A a message to object B. This will result in an arrow from A to B.

If I want to sent a second message from A to B, there will be a second arrow from A to B.
For my understanding, these two messages should be group using only one arrow.

Thanks in advance for any comments,

Thomas