Hello everybody,
I am new around here so I apologize in advance if I posted in the wrong section. I also tried searching for an answer, but could not find one.
I am also new to UML so this might be a stupid question.

Anyway, in a sequence diagram I am trying to create a branched reply message, but Astah does not allow it.
If I try to create a branch from reply it says:
"A Reply Message cannot have a Branch Message."
If I try to insert more that one reply message it says:
"Only one ReplyMessage is allowed on an ExecutionSpecification."

Here You can see a bit better what exactly I am trying to do:
http://d.pr/i/y5nU
(This example is taken from my college textbook and roughly translated to English)
The difference is, in the textbook they made the diagram with ArgoUML which allowed them to have multiple reply messages, like so:
http://d.pr/i/m1cB

report error message that I tried to show in Astah here is actually a line with an arrow and with its type changed.

Now, I am wondering whether having multiple (or branched) reply messages is not allowed by UML specification, or Astah just does not allow it for some reason.

Thank you.