wrongly entered ITC cess amount in 3B July 2017

Sir, I have wrongly entered ITC Rs.12000/in 3B return July 2017 but I have not adjusted the same against any tax liabilities so now how should I rectify the same.
pls. advise me in a correct way

NOTHING CAN BE DONE AS OF NOW.. WAIT FOR GSTR2 TO BECOME ACTIVE