This method was established by the NSE in 2015 to prevent self-trading by a client who has both buy and sell orders for the same scrip open at the same price.

If a client makes a counter order that matches the CO Stop-loss or Target orders, the position will be left hanging with no target or SL order.

Example:

1. If you buy a CO at market price (LTP is 100) with a stop loss of 99, you will make a profit (Both of these orders get placed at the exchange simultaneously). If the scrip falls below 99 before the first leg is executed, the SL order is triggered.