Since futures and spot are also kept in the warehouse, only when you apply for warehouse receipt registration can the spot become a warehouse receipt after inspection.
The cancellation of warehouse receipts means that the owners of these futures warehouse receipts propose cancellation and turn these futures warehouse receipts into cash. Generally speaking, canceling the warehouse receipt means that the inventory in the warehouse will be reduced, but it is not absolute. It means that these warehouse receipts have only been cancelled and have not been taken away from the warehouse, and may become new inventory at any time.
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