Changing wrong GSTIN in GSTIN

Dear Sir/Mam, I am registered as regular tax payer. I file GSTR-1 quarterly. I have mentioned wrong GSTIN for a B2B dealer in GSTR-1 for the quarter ended on 31st March’20. I filed GSTR-1 in July’20 due to covid.

Query- How to amend/change  the GSTIN for B2B dealer in GSTR-1 ?? Pls explain

Note- All other particulars are correct. Only GSTIN is wrongly mentioned in GSTR-1

Thanks a lot ..