Greetings @fu .  The Infernal Revenue Service has pulled a fast one on us.  Prior to 2019, you were required to enter the original sale info in the year of sale only.  In 2019 you are required to enter the original sale info for each subsequent year of the installment sale contract for the life of the contract.

Now you know why you hung onto a copy of every tax return you ever filed over the past 30 years.