Mistake In filing GSTR3B

Parth Amin (52 Points)

17 June 2018  
What is the solution for the following scenario(Mistake)

I had included next month's purchase in the Current years 3B and Submitted.(I.e. Purchase of May is includes in the GSTR3B of April's return and again the in May's GSTR3B i included the the same purchase.both the GSTR3B report are submitted .Please help me to correct my mistake.I used to file GSTR1 in quarterly manner