Export Obligation Period fixed at 90 days for SION based imports, counting from customs clearance for Chapters 7 and 15. Import of inputs permitted under notified Standard Input Output Norms (SION) or upon prior fixation of norms for export of items covered by Chapters 7 and 15 is subject to a pre import condition: the export obligation period runs for 90 days from the date of clearance of each import consignment by the Customs Authority.