GST rule amendments expand GSTR-1A reporting, export refund procedure, appeal filing, and demand payment mechanisms across return forms. The West Bengal Goods and Services Tax Rules are amended to introduce FORM GSTR-1A for optional amendment or addition of current-period outward-supply details before FORM GSTR-3B, with corresponding updates across recipient credit statements, refund forms, e-way bill enrolment, appeal forms and demand-payment forms. The amendment also revises registration verification requirements, reporting thresholds, return timelines, interest computation, export-related refund procedures, and the application and withdrawal framework before the Appellate Tribunal.