Wrong GSTIN mentioned in gstr 1

Rahul M Matang (CA Final) (56 Points)

20 November 2020  

Hello.

I am a GSTR 1 Quarterly fillers.

In June quarter GSTR 1 I have uploaded wrong GSTIN of a party. (Entered B' gstin and bill was given to A)

Now can I amend it in the December Quarter Return ? If not how can i resolve the issue now ? My customer is waiting for my reply.