First, verify that you are allowed to use the FMV, rather than Basis.  In my experience, it is somewhat unusual.to be able to use the FMV when it is higher than Basis.

If you are allowed to use FMV, I think you need to override.  The last I checked, I don't think ProSeries had a way to use FMV (probably because it is unusual that you can use FMV), so you need to override.