Ok, thanks for the idea. I did submit the order as a LMT order with a limitPrice 10% below the last close. I see the same error:
I: May-22 11:50:09.228447 | service.go | ib.placeOrder | sent order: {OrderID:1 ClientID:0 PermID:0 Action:SELL TotalQty:100 OrderType:LMT LimitPrice:133.443...