Hii
1 in books and for income tax purposes show this transaction as stock in transit
2 show in FY 2019-20 as stock in transit and in FT 2020-21 make journal entry in books to convert this stock in transit to purchase
3 in GSTR9 FY 2019-20 show itc claimed in next FY year upto September return
same in FY 2020-21 show itc claimed of earlier year
4 show itc in April 2020 GSTR3B (assuming goods received in April )