Hello,
we had an auction with several items this evening and found an interesting error. We had several identical items at auction and for that we cloned one item several times and then activated the auctions.
Subsequently only one auction ID is assigned for the cloned items, so in the end we had the problem that only one person could put the item in the shopping cart.
So here is the note that items intended for an auction must always be created anew and may not be copied.