When I am in "Edit Item Listing" and hit "Edit associated object", I get list of items from the year 2010 which - do not exist anywhere - once upon a time existed in magic box - magic box is no longer supported, so I remove it from the grid long time ago - I do not use magic box, but I get list of items from non existent magic box - also I do not get a list of new items which I sent to marketplace via Merchant outbox So when I want to associate object with listing I get list of non existent items from non existent magic box but don't get items I sent last month to the marketplace via Merchant outbox. I DID - I did hit the button "Sync Marketplace with Magicboxes" with no effect - BTW this button should be removed because magic boxes are no longer supported. - I waited month but no synchronisation with Merchant outbox and list of objects for association did not appear So basically there IS NO WAY how to update object to existing listing.