Is Form709 ScheduleA Part1 ColumnD (Donor’s adjusted basis of gift) used at all in Tax Computation? Or is it just a reference for IRS in case the donee sells the gift?

I filed a quitclaim and gave my share (50%) of the house to my mother.  The adjusted basis of gift is the half of the purchase price.  Did I make a mistake or is this value not used anywhere on Form 709?

Does IRS want me to enter this adjusted basis solely for their future reference in checking my mother's capital gain if she sells the house?  What's the purpose of this value?