The T4A – Summary only shows what’s in Box 16 & Box 28. Amounts that are not in those boxes will not show up on the T4A – Summary, but they are still there and are still used in your return.
If you have TurboTax Live Assist & Review, here is how to talk to a Tax Expert: https://turbotax.community.intuit.ca/community/navigating-turbotax/help/i-m-using-turbotax-live-assi...
I do realize that the Summary normally only shows the contents of T4A Boxes 16 and 28, and Boxes for releve 1 Box O and Releve 2 Box A, where applicable. However, my Summary for specific T4A slips shows amounts for releve 1 Box O and Releve 2 Box A that are different than the amounts in those boxes when I click on the amounts or on "Edit" to see the underlying slip. The Summary is showing amounts from other T4A/Releve1/2 slips (from different rows of the Summary).
I have been over this problem in detail with one of your Experts who has looked at my screen and he confirmed there is a bug in the system. I have been advised to ignore the amounts shown in the Summary and to rely on what is shown in the underlying slips. Note: this issue only occurs in my T4A Summary. Other Slip summaries are accurate for both Federal and Quebec slips.