We have two applications published in store, each in a free and paid versions.
Now noticed a serious problem with the Nokia Store client.

On S^3 when user has installed the free version of the application, it is impossible to make a purchase the paid version.
Instead "buy" button Nokia Store client shows the "run" button. It starts already installed free version...
Both versions of the apps use the same UID.
It looks like S^3 Nokia Store client monitors the presence of application only by UID

On S^1 there is no problem, everything works as it should.

What is the problem? How to it fix?
We lose sales because not all users realize, first remove the free version before buying.