Changing PartFilled Limit orders

[jp_kettunen]

Let's suppose that my sell limit order has been part filled (e.g. sellOrder.Quantity=4 and sellOrder.Filled=3). Now I want to modify the limit price of that order using ChangeOrder. Question: how to define the order quantity? Should I use

1) sellOrder.Quantity, or
2) sellOrder.Quantity - sellOrder.Filled

[NinjaTrader_JoshP]

I would go with option #2.

[jp_kettunen]

Thanks - JP

[jp_kettunen]

Referring to the discussion below: I Have managed to test this (changing the limit price of a part filled order) on Sim account, and the results show that one should NOT modify order quantity as a function of fills. Example: if my sellOrder.Quantity == 4 and sellOrder.Filled == 3, and I want to change the limit price of the part filled order to myTargetAskPrice, I should submit the change request as follows (no stop defined):

ChangeOrder(sellOrder, sellOrder.Quantity, myTargetAskPrice, 0);