Gstr 9 hsn summary

IN MY DATA 2017-18

INWARD SUPPLIES(PURCHASE) OF HSN SUMMARY  IS NET OF RETURNS

MY QUESTION IS   , A CEMENT DEALER GET CREDIT NOTE (CASH DISCOUNT)

THAT AMOUNT WILL DEDUCT IN HSN SUMMARY OF CEMENT??

FOR EXAMPLE

MY 3B INPUT   TAX    110200+110200 (SGST +CGST)

HSN SUMMARY (PURCAHSES CEMENT)     120300+120300 (SGST+CGST) ONLY PURCHASES 

AND CASH DISCOUNT(CR NOTE)     10100+10100  (SGST +CGST)

IN THESES  GSTR 9 HSN DATA OF PURCHASES  WHICH AMOUNT IS TO RECORD??

120300   OR  110200