Gstr 3B July-2017

Dear sir,

1. We have paid GST on advances
received
July-2017 Rs. 1.44 Lac -(IGST).
Portal show this amount in cash
ledger.

2. By mistake we have not show this
amount in gstr3b July 2017 and
file the return.

3. We file GSTR-1 July-2017 accurate
with advance and liability

4. In the books of accounts we
generate advance liability for July
2017, paid to govt and reclaim as
per gst law

please guide me how can I offset Rs. 1.44 lac.