[Voiceglue] VXML <assign> tag not working?

[emiliano esposito]

As in subject, I can't get it working... is it a OVXI bug?

I've a global application var that can be accessed via scoping, ie

<var name="var" expr="'something'" />

<form id="somewhere">
<block>
<prompt>Var is: <value expr="application.var" /></prompt><!-- 
"application" scope is not necessary, but works -->
</block>
</form>

perfectly works, and produces: "Var is: something".

But I need to assign a menu-dependent value (so it is inside another 
context), and access it elsewhere, like this:

<menu id="n1">
[...]
<assign name="application.var" expr="..." />
[...]
</menu>

as documented here: http://www.w3.org/TR/voicexml20/#dml5.3.2
But that doesn't work at all. What is worse is that even this code 
doesn't work:

<assign name="var" expr="..." /> <!-- var has been defined elsewhere -->
<value expr="var" /> <!-- reports the value given in declaration -->

Or this, that should issue some sort of error, according to W3C 
documentation:

<assign name="var" expr="..." /> <!-- var has NOT been defined, so issue 
an error -->

Is there a way to correct this or is a documented bug of OVXI?
Thanks.