This is the warning I get ...  "Capital gain (or loss) will be reported in Schedule 3 or investment income will be reported in Schedule 4 from T5008(s) entered.  The amount(s) reported in box 20 may or may not reflect the investor's ACB for the purpose of determining the gain or loss from the deposition of the security.  The investor should be aware that he or she may have to make adjustments to the amount indicated in box 20 at the time of determining and reporting his or her gain or loss from the disposition."