Electronic invoice schema standardization updates e invoicing fields and registration notices to align automated GST processes. Amendments extend compliance dates in rule 117, add SEZ registration fields in FORM REG 01 Part B, revise GSTR 3A notices to use discretionary phrasing and include a system generated notice statement, and substitute FORM INV 01 with a comprehensive electronic invoice schema (FORM GST INV 1) defining cardinality, mandatory fields, supplier/buyer/payee blocks, item and tax totals, transport and DSC elements and supporting document parameters.