Turnover wrongly entered but tax correctly entered in gstr3b

A user mistakenly entered the wrong taxable turnover amount in their GSTR-3B, although the tax amount was correct. They are concerned about potential issues with their GSTR-9 and income tax filing, especially as the September 2021 return is already filed and the client is subject to a 44AB audit. The advice given is that if GSTR-1 was filed correctly, GSTR-9 should reflect the correct sales figures, and any discrepancies can be rectified in GSTR-9. It's also recommended to maintain reconciliation records for both tax audit and GST purposes.