If I may add, all commodities like gold, oil, copper, sugar, etc. require a minimum position of $1000 so this is the reason why the platform won't allow you to execute your current trade. You'll be able place a smaller amount and then utilize the leverage as a multiplier so let's say you only have $500 left in your capital, then you can use a leverage of X2 so that you can meet the required minimum position. Also keep in mind that leverage may not be available in some countries depending on which regulator your account is under.