When you trade in a terminal, two types of order execution are available to you.
Inside the system, the type is always used
Immediately. But if you want your order to be sent to the exchange with a delay, for example, after opening a position, use the type
On Position. Such an order will wait for a position on the exchange on the selected market and after that it will be transferred to the exchange. Such an order can be of any type and have any params.