Hi Kaaskop, usually the exchanges don't allow to keep a long position and a short position opened at the same time. So, if you already have a short position opened (for example, 1000$), if you open directly a long position with 2000$, it would automatically close your short and open a 1000$ long. If you want to open both longs and shorts at the same time, you would need 2 accounts. In the case you have 1 account, the way to go is to close the previous one before opening other position. For example, you open a short, then close that short, now open a long.