Dubai Mercantile Exchange (DME) has seen impressive trading volumes in its newly launched Oman crude oil futures, despite some traders reportedly being caught short and unable to get out of their positions due to a lack of deep liquidity.A month after being launched, volumes and open interest totalled 4,000 contracts, equivalent to 4m barrels of crude oil going for physical delivery in August. Only once has this figure for contracts going to physical delivery been...