B2B invoice means

Hot to rectify if B2B invoice show it as a B2CS?

But we have already paid tax. Now i need to revise B2CS and B2B. Other wise receipient put it in missing invoice, again i have to pay tax including interest.

If i Accept in GSTR 1A means i have to pay tax in GSTR 3 rit.

Okay. But how can i get refund. Because we are already paid tax in B2CS. Is there any option for that?