This add-on helps prevent GST return mismatches by allowing users to lock only GST-related vouchers that are part of filed returns, ensuring that finalized data in GSTR1 and GSTR3B cannot be altered after submission. It addresses common issues arising in multi-user environments where post-filing changes or accidental entries create discrepancies in reported returns, even after reconciliation. Unlike full backdated voucher locking, this solution selectively restricts creation, alteration, and deletion of only GST-relevant transactions such as those affecting GSTR1 and GSTR3B, while keeping other operational vouchers like payment, contra, stock, and order entries unaffected for day-to-day business use. Note: Minor mismatches may still occur due to changes in master data configurations.