GSTR 9 HSN SUMMARY NEGATIVE VALUE

HOW TO ENTER NEGATIVE VALUE IN GSTR-9  HSN SUMMARY( OUTWARD SUPPLIES)

Reason:-

sold goods  in FY 20-21(MARCH)  -   20000+2800+2800 (SGST(14)  CGST (14))

And that item returned by customer on april 21(FY 21-22)  And refunded to customer

so in FY 21-22   HSN summary of that 28 %   item showing negative value- unable to enter negative data in gstr9

any solutions??