Is the order marketable?
A BUY order is marketable if the buy price is greater than or equal to the Best Offer (BO). A SELL order is marketable if the sell price is less than or equal to the Best Bid (BB). Market orders are always considered marketable. Note that SuperMontage and INET do not accept non-marketable limit orders (limit orders which are away from the current market and therefore not immediately executable). Consequently such orders can only be routed through IB SmartRouting or sent directly to another exchange.