I had exactly the same problem and this solution worked for me and allowed me to finally NetFile the affected return. This issue affected 3 out of 6 T3 Statements and did result in a change to the bottom line with a reduced refund. I was already uncomfortable with TurboTax insisting on forcing the same value twice in the two T3 box 21 fields Capital Gains and Foreign Capital Gains, which was likely the source of the Errors.
I entered the values in Capital Gains Box 21 and in Capital Gains Boxes 52 & 53 as reported on the T3 Statements. These are large mutual funds that include both Canadian and Global investments anyway.
This issue has been going on for far too long and despite several updates which were all promised to fix this issue since 17 March it was still showing the same two errors today 17 April. The return needed to be filed and there is a large refund involved, so we will trust CRA to verify the results and make any changes - the 3 affected T3 Statements are all on file in My Account.
This is a TurboTax software problem and not a CRA Issue! After 20 years of using QuickTax and TurboTax I plan to use UFile next year for our family member returns.
