GSTR 1 AND 3B difference

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If there is a difference in output tax liability as per sales reported in gstr1 and tax paid in gstr 3b, there is an automated intimation will be reflected under services tab under returns and return compliance tab where you can reply towards the intimation called DRC 01 B.
if unattended the portal denies filing gstr 1 for the following month untill you file DRC 01B. this got recently notified.

The difference will get solved once you rectify in subsequent returns or incorporate it in gstr 1 and 3B