Use the Unreserve option in the COG Menu:

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Hi,

When you create a Purchase Order (PO) in Odoo, the 'Received Quantity*'should normally start at 0 and only update when you actually receive the goods through a validated receipt in the Inventory app. If you see that the Requested and Received quantities are already the same right after creating or confirming the PO, it usually means there’s a configuration or customization issue. In standard Odoo, this happens when the product’s  Control Policy under the Purchase tab is set to On ordered quantities”  instead of Receive goods  Changing it to “Receive goods” ensures that the *Received Quantity* stays at 0 until the products are physically received.

Another possible reason is that the product type is set to Service, which behaves differently and automatically updates the received quantity when the PO is confirmed. Make sure your products are set as a Storable Product or a Consumable if you want to track physical receipt. If configurations look fine, check for custom modules or automated actions that may be updating `qty_received` automatically after PO confirmation — for instance, a custom method overriding `_compute_qty_received` or an automated action modifying the field. Disabling or correcting that logic will fix the issue. Once resolved, new purchase orders will correctly show Received = 0 until you actually receive and validate the products.

Hope it helps.