Form 7

Dear Friends,Initially when at the time of outward supply customer has not shared the GST number. But in October filing customer based on GSTR2A raised a debit note as his supply is not appearing. But I have shown under From 7 (B2C) in the absence of GST Number.Now the customer shared his GST Number. Please advise how to correct the same in October return. Please note GSTR1 filing is on quarterly basis.Regards Balasubramanian