B2b sales wrongly shown in b2cl in 2017-18

First of all you have to ascertain that if your invoices were of Interstate parties having value more then 2.5 lac, then there is nothing wrong you did as per your question. Because in B2CL sheet system accepts only interstate transaction more than 2.5 lac. And it is same like B2B sheet. Your problem perhaps could be like you shown in B2CS, the supplies of B2B. If yes then in the subsequent return modify the B2CS value in Amendment, for example decrease in sales. And Add invoices in B2B sheet of year 2017 along with new invoices. You are done.

Yes, you can make amendment in next month GSTR1 returns with original date of invoice.

thank you very much sir...

thank you very much..