GSTR 1 query

This discussion addresses a query regarding cancelling bills in GSTR 1 after filing for March 2020 and subsequently paying GST in GSTR 3B. The consensus is that once a return for a particular month is filed, output tax for that period cannot be reversed, and a refund for the paid GST is generally not claimable. The possibility of such adjustments for June 2020 was also briefly considered.