RP as URP

satish Motipalli (Student CA Final ) (119 Points)

21 February 2019  
Dear Sir/Madam,
In Nov-17 Month GSTR1 we filled return with registered person as unregistered person. i.e instead of B2B we filled as B2C for one party. now the party is asking to amendment the details. please help me how to amendment this entry.
thank you