What does "Order size not correct" mean?

This message is a precautionary warning message that means the order size you have submitted is higher than what you have configured in your Precautionary Settings. The message allows you to double-check your order details and gives you the option to override the message and transmit the order. You can modify your Precautionary Settings within the…

The maximum order size for stocks is 500,000 shares.

IBKR does not have a maximum order size for most other products, but you are limited to the amount of cash or margin in your account…

For CME Event Contracts, the minimum trade size for a single order is one contract. The maximum trade size for a single order is 250 contracts…

This message "Display size is not supported for OTCBB stocks" indicates that the Iceberg order type is not supported for US Penny Stocks.

Additional Information…