diff between positionupdate and onexectution methods

[junkone]

what changes on the orders would trigger these two. what is the difference between them?

[NinjaTrader_JoshP]

junkone,

OnExecution is triggered whenever you have an order execution. Orders can be filled via multiple executions. Should use this to submit stop/targets for entry orders and other types of logic.

OnPositionUpdate comes after OnExecution. Not every execution is guaranteed an OnPositionUpdate event. Should use this for position size management/PnL and things like that.

[junkone]

if i want to use for pnl, does it get called for every dollar change in unrealised profits?
what is list of attribute changes that can trigger OnPositionUpdate

[NinjaTrader_JoshP]

No, OnPositionUpdate() only receives events when your position changes. Whether that is adding to or reducing your position.