Correction in invoicein gstr1

While filing GSTR3B for last 2 months, Tax paid as IGST (as place of supply is other than billing state) but due to some mistake, while filing GSTR1, Place of Supply was entered as billing state.

Now when I do reconciliation of the same, output tax is displayed as CGST + SGST and tax deposited by me as IGST.

Now I want to correct the same.  Can I correct the same in current month's GSTR1 (in amendment of Invoice section).  Just Place of Supply will be change and all other details (date/Invoice value etc are unchanged).  Can I do so?

Further, It will attract any Interest liablility or not?

As per my view, there is no Interest liability because I had already deposited tax as IGST.

Please help. 

Thanks in Advance....