Error in gstr 3b

Manisa (student) (103 Points)

02 November 2017  

I have an outward taxable service of ₹ 6500 and itc of ₹ 1200. But while filing gstr 3b for Sep month I have only mentioned itc of ₹1200. Further I have paid the balance amount of ₹ 5300. How should I account for the missed invoice of ₹ 6500 as I have already filed the return. Kindly guide me the further course of action.