Gstr 2 under cdn which note type i need to enter d or c

I have purchased Goods in July 17 and my supplier has filed his GSTR 1 for the month of July 17. Further i have returned some part of Goods to Supplier  in the month of Oct 17 against same invoice number. So in this case do i need to issue and entered Debit note in my GSTR 2 ??? because that debit note will reflect in GSTR 1A of supplier.