Case T-110/17: Judgment of the General Court of 8 July 2020 — Jiangsu Seraphim Solar System v Commission (Dumping — Imports of crystalline silicon photovoltaic modules and key components (i.e. cells) originating in or consigned from the People’s Republic of China — Undertakings — Admissibility — Implementing Regulation (EU) 2016/2146 — Invalidation of undertaking invoices — Temporal application of new provisions)