Reversal in GSTR-9?

In the F.Y.2017-18 i have uploaded wrong data of GSTR3B and till date haven’t rectified the same. Due to this effect my liability and ITC has been shown excess from the actual data of the respected firm the effect of the wrong uploaded data on taxability is neutral.. So can i rectify my mistake in GSTR-9(i.e. Annual return). If yes then kindly guide us under which table we can show it and rectify the same error.