What is the relationship between ChangeOrder() and OnOrderUpdate() ?

[fx.practic]

Hello.

Does ChangeOrder() always triggers OnOrderUpdate() ?
Or does it triggers only if something really changed in orders parameters?
Or it depends of something else?

I am using a flag variable Is_Change_Submitted that set to TRUE when order changes submitted.
And I am going to set flag to FALSE in OnOrderUpdate(), but it is not triggered and the flag remains TRUE forever.

So, what it correct way to handle orders changes?
Do I need Is_Change_Submitted flag at all?
Are there any scenarios where it can be useful?
For example, can I change again or cancel order while it already submitted to change?
Or what if strategy submit price change and, before order state changed to ChangeSubmitted, strategy will submit quantity change?

Or I shouldn't care about it in Umnanaged approach?

Thank you.

[NinjaTrader_ChelseaB]

Hello fx.practic,

Calling ChangeOrder() will cause OnOrderUpdate() to trigger, even if the values are the same for the working order.

I would recommend not calling ChangeOrder() if the values are the same, and only call this when you are wanting to change the order price or quantity.

Below is a link to an unmanaged script that calls ChangeOrder().

https://ninjatrader.com/support/forum/forum/ninjatrader-8/platform-technical-support-aa/97419-priceos-cs-expecting?p=802269#post802269

[fx.practic]

Thank you.
Will search for bug on my side now.

Ok. Here is once more question:
if I am sending CL order with price like 100.248524850896.
What will be the price of working order? Will it be like original (100.248524850896) or it will be rounded to tick size (100.25)?

[NinjaTrader_ChelseaB]

Hello fx.practic,

The order may be ignored or rejected.

I think the order price must be conformed to a tick size.

[fx.practic]

It never was rejected or ignored because of this reason in my practice.
So, the best approach is to RoundToTIckSize before to send and before to change order.
Thank you.