You aren't claiming it as income, so it doesn't matter that the payments were received in different years.
You are reconciling the credit - and to do so the program needs to know if you already received both payments, and if so the amount in order to determine if any additional amounts are due to you.
If you received it, and you indicate that you didn't, then the program will generate an additional credit for you. That credit will not match the IRS records and your entire refund will be delayed while your return goes through review and adjustment.
