Gstr3b revise

In March 2020 GSTR3B return the turnover of 1/4/2019 to 31/3/2020 is uploaded bymistake instead of the turnover of month March. Jason file of complete year is uploaded from tally. But GSTR-1 is uploaded according to actual turnover. The excess turnover which is uploaded in GSTR3B can be adjusted in the next return, but since this uploaded turnover is of 1 year it could not be adjusted in 1 month 3B return. It can be adjusted in 3B return of next 1 year. But this adjustment can be done only till the September 30 return. Is it legal if the adjustment is done in GSTR9 & 9C instead of 3B.