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There are two types of OCO-groups in MultiCharts: Native and Simulated.
Native OCO-group is used when the broker’s API supports OCO-groups. In this case all OCO orders are sent to the broker directly and unfilled OCO orders will be cancelled by the broker. (Native OCO-group is supported by CQG (since ver. 9.1), Interactive Brokers, FXCM and IWBank).
Simulated OCO-group means that all OCO orders will be sent to the broker, but once one of them is filled, other orders from this OCO group will be cancelled by MultiCharts. In this case, when one of the OCO orders is filled, MultiCharts will send a command to cancel or reduce size of the second OCO order to the broker.
Such brokers as FXCM, OpenECry, GAIN Capital and Rithmic and Zen-Fire reject stop orders that are obviously executable at the moment when they are received. For example, if the market price of the instrument is 10 and you send a stop order with condition to buy at 9 or worse, then this order will be rejected by these brokers. MultiCharts converts such orders to market ones. So the stop order with condition to buy at 9 or worse can be executed at the price of 10.
In this case you should be aware that if the price goes down for example to 8 at the moment when MultiCharts sends market order, the order will be filled at 8 and not at 9 or worse.
