Filter admin inlines

Hello,
I have three models
X
Lang
Y
where the purpose of Y is to provide X fields in other languages.
So I have Y as
Y
x foreignkey on X
lang ForeignKey on Lang
additionalfields...

I have created the ModelAdmin for Lang. For X I have the ModelAdmin and added the
    inlines = [
        YInline,
        ]

So far so good: I have the form of X with inlines for Y with a dropdown on languages.
Now I have extended the user profile as documented in django docs. I have succesfully overriden the queryset method ot he LangModelAdmin so to filter on some user profile additinal information.
The problem is that I can not filter the inlines; i.e. I want that every user has its owns languages and thus I want to see in X form the language dropdown filled with only certain languages. Instead all languages are listed there.
I have searched a bit and it seems a common problem,but without solution.
Am I missing something simple?
Thanks

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