Why do I see the error ‘243: Order Cancelled – SPOS Price Undetermined’ when my order is rejected?
In case of no price discovery in a special pre-open session, orders will be cancelled by the system, and the security will continue to trade under the call auction mechanism until the price is discovered.
For more details, please check: https://www.bseindia.com/static/markets/equity/special_preopen.html