You can use Instrument.Factor for this.
你能使用Instrument.Factor达到这个目的
Position.Value = Instrument.Price * Instrument.Factor * Position.Qty
"Factor" terminology comes from FIX (Financial Information eXchange) protocol, www.fixprotocol.org, which we follow in OpenQuant business object model.
"Factor"这一术语来源于FIX（金融信息交换）协议，www.fixprotocol.org，我们在OpenQuant业务对象模型中遵守这一协议。