You may experience cases where a Contract Option is not enabled for short-selling. In such cases you will receive the following error message: "You are not allowed to increase your exposure in an adjusted option ticker. Please choose the updated option ticker."
This issue is connected to the risk rating of the Contract Option. If the risk rating of a Contract Option is 6, then it is not possible to short-sell it under any circumstances. You will always be able to find the risk rating of an instrument in the Trading Conditions under Instrument.
The risk rating is determined by Saxo Bank with risk rating 6 being the lowest rating possible. A significant part of the risk depends on the market capitalization, liquidity, volatility, country of incorporation, industry and M&A Activity of the underlying instrument.