ITC for lost or stolen

If OCT purchase rs 10000 and amount tax rs 1200. Input claim in that purchase.
Now November month goods damage now amount of ITC rs 1200 ineligible .
My query is first when filling gstr3b in November ITC colum 4 d 1 17 (5) rs 1200 filling this colum
then amount input already claim in October 1200 how can reverse
is amount both reverse other 1200 as well colum d 1