prepopulated_fields do not work at all Django 1.2

I have strange problem, on my development server everything is fine
but I'm use Django 1.1 but on the production server (Django 1.2)
prepopulated_fields don't work. Does anyone have the same problem? Any
suggestion?

class UniverzitetAdmin(admin.ModelAdmin):
prepopulated_fields = {"url": ("naziv",)}

admin.site.register(Univerzitet, UniverzitetAdmin)

Thanks

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