[seq diag] return message within a fragment

[Carm]

I am using EA10 and I have an issue with the fragments.
Let's say we have a diagram with 3 lifelines : 1 actor on the far left and two objects.
I initiate a process with a message from the actor to one of the other objects and there is a collection of messages between the two objects.
Then I want to model the fact that at some point the execution flow returns back to the user, but only on certain conditions. If we are not in the given conditions, the execution flow should continue between the two objects.
If I try to model that in EA10, I flag the return message within the fragment as "isReturn" and the execution flow on the source lifetime ends. For EA, I am not anymore in the same execution context and the rest of the execution flow seems to be considered as being in error, syntactically speaking (the lifeline on the actor is no more considered within an execution context either.

See attached screenshot for clarification : http://img547.imageshack.us/img547/6406/a57m.png

Am I missing something ?