I am a non-resident and entered my Canadian investment capital gains under the T5008 in TurboTax. When selecting capital gains, it does not allow the Proceeds amount to be negative ("May contain a negative amount only if the type of securities in box 15 is a future (FUT) or an option contract "), so I don't see how to enter a capital loss. I also do not see the tax number changed when I make additional capital gains entries. Am I missing something in this process?