16418 : Order with Invalid attributes rejected by the system
Pre market orders can only be placed from 9:00am to 9:07am & only Limit [LMT] & Market [MKT] orders can be placed. If the above rule isn’t followed the order gets rejected & the above error is displayed.
If an After Market Order [AMO] order type other than Limit [LMT] or Market [MKT] is placed the order gets rejected and the above error will be shown.