I have an issue when changing the stop order price. It throws an error saying it can’t be changed because the quantity can’t be less than one? It’s important to note that this code below hasn’t changed in months and it was working fine until recently… now this error started popping up just around the same time the latest NT version was released. I suspect something has changed in the NT backend that is causing it.
Here is the code I am using…
Order order = orders[LONG]; // get order from map
order.StopPriceChanged = Instrument.MasterInstrument.RoundToTickSize(price);
Account.Change(new[] { order });
Here is a pic of the error message…
Also here is my custom logging message…
INFO [ SimNT 3 6J DEC25 ] changing order: LongBreak price: 0.006511 to: 0.0065105
INFO [ SimNT 3 6J DEC25 ] OnOrderUpdate order: orderId=‘a3b8298fde784447837ceff96b56525f’ account=‘SimNT 3’ name=‘LongBreak’ orderState=ChangePending instrument=‘6J DEC25’ orderAction=Buy orderType=‘Stop Market’ limitPrice=0 stopPrice=0.006511 quantity=8 tif=Gtc oco=‘’ filled=0 averageFillPrice=0 onBehalfOf=‘’ id=42923 time=‘2025-11-11 17:48:58’ gtd=‘2099-12-01’ statementDate=‘2025-11-11’
INFO [ SimNT 3 6J DEC25 ] OnOrderUpdate order: orderId=‘a3b8298fde784447837ceff96b56525f’ account=‘SimNT 3’ name=‘LongBreak’ orderState=Accepted instrument=‘6J DEC25’ orderAction=Buy orderType=‘Stop Market’ limitPrice=0 stopPrice=0.006511 quantity=8 tif=Gtc oco=‘’ filled=0 averageFillPrice=0 onBehalfOf=‘’ id=42923 time=‘2025-11-11 17:48:58’ gtd=‘2099-12-01’ statementDate=‘2025-11-11’
Then it throws this error code…
ErrorCode.UnableToChangeOrder
Not sure why the popup message is talking about quantity when the code is only trying to change the stop price?
TIA