It's possible you are seeing this prompt because the "Canadian Pension" line was clicked inadvertently under the Retirement Plans and Social Security subheading in Wages & Income.
When you are in the Retirement Plans and Social Security section, one of the options to choose is Canadian Registered Pension Income. Go back to Wages & Income, select Retirement Plans and Social Security, and check what entries were made. Delete any entries made in the Canadian Pension section.
If you have inadvertently started a Canadian Pension form, you can delete it. Here are the directions for Online and Desktop versions:
If you are using: