Can ewb value modified in gstr1 after delivery of goods

This discussion explores whether a debit note's value can be amended in GSTR1 after goods have been delivered and the E-Way Bill (EWB) has been filed. The user issued a debit note for £80,000, which was reflected in the EWB and filed in GSTR1. However, the supplier is only refunding £40,000. The user is concerned about the discrepancy between the EWB value and the actual refund, and whether amending GSTR1 will cause issues.