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Error message "Invalid item" when an item is placed in the cart.

Problem: When using shopping cart integration links and ordering an item an
error message "Invalid item/Artikel ungtig" is displayed.

Solution: Open eShop Administration. Go to 'Settings' -> 'Advanced Settings'
-> 'Basic settings' -> 'Security settings for shopping cart integration'
Choose "Yes" for Deactivate secure shopping cart integration? and click Save changes.