ChangeOrder() and Filled question

[misova]

I would like to ask about one scenario in Unmanaged mode.

1. Imagine we have existing partially filled order = 10 / 100 contracts are filled, so order-state is PartFilled.
2. Now I call ChangeOrder(...) on this order with new quantity15 and same prices.

Now, when I call order.Filled - what value I get?
a) Filled == 10 contracts remains, because only unfilled part of the order was modified, but it is still the same order that holds its original values
b) Filled == 0, because changing the order completely replaced the order for new one

Which one is right a) or b) ?

[NinjaTrader_ZacharyG]

Hello misova,

Thank you for your inquiry.

order.Filled would return a value of 10 as your order has filled 10 contracts.

Please, let us know if we may be of further assistance.

[misova]

Thank you for your quick answer

so if I understand it correctly, then
Assumption 1
IOrder.Quantity always means just "Remaining / Unfilled" quantity of the order in the NT7 API.
Is it right?

Assumption 2
And if the order is in state PartFilled, then IOrder.Quantity will return only the "Remaining / Unfilled" part of the order. Is this right too?

Assumption 3
If I use ChangeOrder(...) in Unmanaged mode and change there quantity of the order, then I am changing only the "Remaining / Unfilled" part of the order. Is this right too?

[NinjaTrader_ZacharyG]

Hello misova,

1 & 2
order.Quantity will return the quantity of the order that you have specified, regardless of filled/unfilled contracts.

3
When you are calling ChangeOrder(), the IOrder object is being changed. This would change the object's quantity to the quantity you've specified in your ChangeOrder().