The insufficient number of available positions means that there are not many stocks in the user's stock account to sell. Under normal circumstances, if an individual's stock account does have enough positions, it is very likely that the stocks bought on the same day cannot be sold and will not be traded until the next day. In another case, some stocks are pending due to the sale of the previous consignment order, but the transaction has not been completed. In this case, the order can be cancelled and the order can be re-pending.

Before the expiration of physical delivery or cash delivery, investors can voluntarily decide to buy and sell futures contracts according to market conditions and personal wishes. However, investors (bulls or bears) hold futures contracts without performing reverse operations (selling or buying) with the same delivery month and quantity. This operation is called "holding positions". In the futures operation of gold and other commodities, whether buying or selling, all new positions are called opening positions. After the operator opens a position, he holds a position in his hand, which is called a position.