Excess ITC claimed, how to revise.

Hello,

My query is related to GSTR3B filed in December.

I've been filing GSTR3B and claiming ITC as per invoices I had.(never minded about values from GSTR2B)

however from December ITC was getting auto populated in 3B (as per invoices in 2B) and we can't change that.

So I didn't bother much and claimed ITC according to what was auto inserted.

But I realised that I claimed ITC even for those invoices for which I already had claimed ITC in last return.

those invoices were captured now in 2B from where ITC was populated.

so how can I reverse duplicate ITC claimed.

thanks in advance.