You have to input the contribution, which will calculate as non-deductible and appear on the 8606.

Then you enter the 1099-R which should show as not income since you have basis from the non-deductible contribution.

It gets messy when you also have no basis IRAs too which appear in the 8606 elsewhere. BUT you have to have the no basis IRAs because some of the conversion money might be taxable, coming from those previously deducted IRAs.