If you have a duplicate entry of your T4A(P) Canada Pension Plan Benefits, you'll need to delete one entry. This often happens if you have used the CRA AutoFill feature to import your tax slips, then manually entered some or all of them.

To delete this entry, go to the "Find" button, type in T4A, select T4A(P) and click "Go". Then delete one of the entries which have been double entered.