[news.eclipse.technology.equinox] Can't update product itself with p2

[florian.over@xxxxxxxxxxxxxx (Florian Over)]

Hi brave p2-knights,

we have the following setup:
Standalone RCP-Product with dozen of features and p2-alized :).

At the start of the product we update everything without letting the user 
deceide anything (Automatically updating everything!).
Features and their including plugins, which are not in the delievered 
product, are updateable.
Also after this initial installation, update of this features is possible.

But, every feature in the initial product, ist not updateable. It 
downloads the plugin, but does nothing further.
Also the product will never get the new version.

We have a site.xml, where we do "build.all"

Any hints if its possible to update a product?
Do we have to unload all Features in the product first?

Best Regards Florian Over.