In GSTR2B, a new feature has been added to cater round off amount errors. Since, round off amount leads to mismatch in GSTR2B, now users can set an amount range which will be considered as tolerance limit, and any difference up to the defined amount(both upward & downward) will be ignored while matching.
How to set tolerance limit?
Go to Settings>Configurations>Compliances> General> GSTR-2B Tolerance Limit