Can't place bracket orders (stop-loss and take-profit) one after the other

[Tzion]

Description

Getting InvalidOrder Exception when trying to place bracket orders (stop-loss and take-profit) during backtesting of a strategy (paper trade)

blankly.utils.exceptions.InvalidOrder: Not enough base currency. Available: 0.0. hold: 1.0. requested: 1.0.

# Place orders
state.interface.market_order(symbol, side='buy', size=1)
state.interface.take_profit_order(symbol, size=1, price=take_profit)
state.interface.stop_loss_order(symbol, size=1, price=stop_loss)  # Getting the exception here

It happens due to the fact that the quantity is being held after take-profit order

settings.json

Paper account on Binance exchange
Using default settings

Error (if applicable)

> `blankly.utils.exceptions.InvalidOrder: Not enough base currency. Available: 0.0. hold: 1.0. requested: 1.0.` 

Platform Info

• Python version: 3.10.13
• Platform: mac-os Ventura 13.5.2 (22G91)

[Tzion]

After some investigation I realize that this is the way Binance (and probably other crypto exchanges) works - by holding the fund after placing an order.
I've tried to do it on Paper exchange (exchange = PaperTrade(Binance())) hoping it will allow me send the orders, and yet the second one is invalid.

[(Maybe this issue should be tagged by feature request - support of OCO (one cancel other) orders]