Itr2 filling of certain missing values

While a filling ITR 2 online under CG Long term capital gains immovable property there are few clarifications.

1. There is no column/space for filling in Acquisition cost , Indexation factor, Date of purchase etc There are spaces and cells for giving consolidated figures only.

Please inform whether the calculation sheet  be preserved for further reference. 

2. Why these important particulars are missing in ITR2.