Schedule E worksheet, TT flags sale date of non depreciable rental asset (bare land) as not supported for type X?

I leased a bare lot for the past few years.  I flagged the lot as Type X non-depreciable when I first entered the property information.  I sold the property last year and TurboTax is flagging the date of acquistion/date of sale as not supported for Type X property.  How do I account for my gain on the sale of a rental property that was bare land and therefore not depreciable.