The FISME is seeking an additional 9 months for the successful implementation of the Invoice Management System (IMS), which aims to help taxpayers claim input tax credits by allowing them to accept, reject, or keep pending invoices from suppliers. The system is not fully optional, and the implementation timeline is too short. Meanwhile, the FISME Secretary General, Anil Bhardwaj, argues for a pilot period to identify and solve challenges and help retailers adopt IMS.