I have seen a situation where the difference is material, where a 3115 was filed to correct the Cost Basis, and to calculate the depreciation which should have been taken.

The Depreciation difference (Under or Over reported...sounds like under in this case) was then reported as  an expense in the year of the correction as a current expense. (in the case I saw, it was the year before the sale).,

The Sale was then reported as if everything had been done correctly from the start. I have no experience as to the final outcome, as this was a recent filing.