Partial execution means that only some of your orders got filled. This occurs when there aren’t enough orders to fully execute your order and mostly with limit orders placed on low-volume orders.
To execute an order, there must be a buyer and seller on both sides of the trade. So, if there aren’t enough shares in the market at your limit price, it may take multiple trades to fill the entire order.
ABC is a coin trading at INR 10.
You place an order to sell 1,000 shares of ABC at INR 11.
Your order matches a buyer willing to pay INR 11 for 400 shares.
Your order receives a partial execution of 400 instead of 1,000 because there weren’t enough orders available at your specified price of INR 11.