Can't delete some products from the list

Hello,

In my product list there are several items that can't be deleted. It went wrong with filling in the info about this items and after that I couldn;t delete these.

Until now I didn't think it would bother but it seems that these products are listed in the search engine. And nowhere else. And the price isn't up to date. So today somebody placed an order and found one of these items.

What's wrong why couldn't I delete these items from the list?

can someone help me out with this.

Working on 1.5.6

Nobody that can tell me whats wrong?

I had this happen when adding a product and not linking it to a category, then couldn't edit it or delete it. Could not figure out why as I have made a lot of changes and was unable to replicate the problem on a clean install.

To remove the items completely delete them from the product database tables in phpmyadmin.

that's the same problem I'm having.
Will look up in the phpmyadmin but it's weird that it couldn't be replicated..