Thumbnail dosen´t show from store?

Hi there.
Im currently working on a site, which someone else have made in Drupal 7.
I have a content type of product, which contains title, picture and so on.
If i add a simple product, there´s nothing wrong and it works, with the thumbnail in the view.
But in the content type product i can also add an existing product from the store, which also contains pictures, title and so on.
But the thumbnail won´t show up from that in the view???
Any ideas?
It´s a little hard to explain.

Regards Peter