Why did I receive a message regarding open orders on both sides of the market?

This message indicates you are attempting to place an order without having live market data. You may bypass this message on the TWS and place your trade, or if you wish to receive live data, log in to Client Portal…

It is against regulatory rules to trade with your own orders. If you currently have a limit order working and you place a MKT order for the same product on the other side of the market, you will receive this warning as it is possible those two orders could trade with one another. To avoid this, use limit orders with specified prices so your open Buy and Sell orders will not cross…

You will receive the aforementioned message when you are trying to submit more than 15 orders on either the buy or sell side for a particular contract in your account. An additional order on the same side for the same contract will not be allowed until an existing order has been cancelled or executed. This limitation has been set up by IBKR Risk Management. Please…

A Market-on-Open (MOO) order combines a market order with the OPG time in force to create an order that is automatically submitted at the market's open and fills at the market price.

To place a Market-on-Open order from the Mosaic Order Entry panel:…