Form 3B rectification

In Form 3B for the month of October outward supply was understated mistakenly. Government earlier told that the mistake can rectified at the time of Gstr 3 filing. However Gstr 3 dates not yet notified and recipient will not be able to take itc as supplier has not paid taxes fully. When to pay the balance tax along with interest? Can it be paid in Form 3B for the month of November. Please suggest ways. Thanks in advance.