What is used as a secondary tool if the MMSY is unavailable?

The D818-Cumulative Reject Listing serves as a secondary tool when the Materiel Movement Status (MMSY) is unavailable, making it vital for tracking inventory and supply chain issues. This listing provides comprehensive data regarding items that have been rejected during processing, allowing supply chain personnel to identify and resolve discrepancies or issues quickly. Efficiently utilizing the D818 can help maintain oversight of inventory status, ensuring that supply chain operations continue smoothly even in the absence of the MMSY.

The other options play various roles in supply chain management but do not specifically act as a backup to the MMSY. The D047-Transaction Summary summarizes transaction activities but does not track rejects. The M560-Inventory Tracker focuses on inventory levels rather than rejected items, and the D990-Logistics Overview provides a higher-level snapshot of logistics data, which is not directly related to the specifics of managing reject listings. Thus, the D818's role as a secondary tool is essential for addressing issues that arise in the supply chain when primary tracking methods are disrupted.