I am not sure if you are having the same issue as others like me, but I found that downloading the T3/RL16 from CRA caused a DUPLICATE form to be created that combined the data from all the separate forms but somehow did not have some of the taxable dividend on it. So after checking carefully against my T3/RL16 paper receipts, I found the duplicate form (the one that had totals of all other forms in some of the fields), and deleted that DUPLICATE. Was able to Netfile QC with no more error.
