xxforms:set-session-attribute doesn't work in FR 3.9

> Hi all!
> We've been using Orbeon Forms 3.8 for one year(mainly Form Builder and Form
> Runner). In our forms we've been setting session attributes for the rest of
> our application. So that's why we've had lots of read-only fields with
> "Initial value" set to, say, "xxforms:set-session-attribute('q','lmn')" and
> it worked just like a charm.
> But the version 3.9 wan't let us do such things. I've set up a sample form
> in the demo Form Builder on the orbeon.com site, as you can see, it gives us
> an exception: http://orbeon.com/orbeon/fr/w/w/new (you can see this form
> with the name 'w' and the application name 'w' in the form builder at
> http://orbeon.com/orbeon/fr/) .
> That means, we can't even set a plain string literal as a session attribute(
> Is it possible to solve this issue?
> Best regards,
> Maria Belkina
>
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> Erik, do you have any clues on how to deal with this issue?
>
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