GST excess paid in last FY

can I do the tax adjustment of last year during this year. 
Actually some IGST turnover was shown in States turnover by mistake last year. we made the IGST payment also last year when identified, but the payment that was made as SGST & CGST against same sale could not be adjusted as we had the idea that 3b cant be revised. GSTR1 was correctly filed. Can we adjust the excess CGST & SGST this month by showing less state's turnover this month by the same amount that was shown in excess during last year by mistake.
please suggest.