I actually tried that (and slight variations) when I saw your original post last night, but it did not work for me.
What happens is that IB automatically sets the quantity for #3 to the same full amount of #1. I guess the basic idea is that the profit and stop legs of a bracket order should protect the entire position.
If you just place orders #1, #3, and #4 (no stop loss orders in the brackets) you can actually adjust quantities to Full/Half/Half right after the three orders are placed. Both via API or TWS. But once #1 was filled, IB again adjusted quantity of? #3 to the actually filled quantity. Again it was possible to adjust the quantity of #3 (the now active order) to Half via API or TWS.
When placing all five orders, quantity changes failed via API and the fields were greyed out in TWS.
JR
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On Thu, Apr 29, 2021 at 10:22 AM, Levente wrote:
Unfortunately I did not have the luxury (time) to try this out myself, so a BIG thank you to Richard.
However, I managed to call IB API support and was suggested the following:
Create 5 (!!!) orders
1. Position opening order (assume ID is 1)
2. Stop loss order for the full amount (assume ID is 2) + set parent to 1
3. Take profit order for HALF of the amount?(assume ID is 3) + set parent to 1
4. Take profit order for HALF of the amount at the other price level (assume ID is 4)? + set parent to 3
5. Stop loss order for HALF of the amount (assume ID is 5) + set parent to 3
When position opening order fills, orders with ID 2 and 3 will get activated.
If stop loss order 2 fills, the take profit 3 will get cancelled and orders 4 and 5 will never activate.
If take profit order 3 fills, the stop loss order 2 will get cancelled, and orders 4 and 5 will get activated and will belong to a NEW OCA group.
I will try this out and will post my findings.
