Netting mode allows you to have only one common position for a symbol at the same time. If there is an open position for a symbol, executing a deal in the same direction increases the volume of this position. If a deal is executed in the opposite direction, the volume can decrease, the position can close (when the volumes match) or reverse. Hedging mode allows you to have multiple positions per symbol, including oppositely directed ones.
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What is netting and hedging mode on the platform?