Fail to show service in gstr 1 & gstr 3b

I Failed to Show the Service Bill For One Party From July 2017 to June 2018 ( 20 Bills For Rs. 1000000, GST 120000 ) in GSTR 1 & GSTR 3B  i have filed the GST returns Upto Date Correctly now only we noticed  that we have not filed the GST for Servicre amounts can i show the service amount in July 3B return and pay the tax along with interest and show the service in GSTR - 1 of July 2018 with Date & Bill Number of July 2017 to March 2018