Hi,

To re-import Sales Orders in Odoo without losing data, export the order with the "I want to update data (import-compatible export)" option. This includes key IDs that help Odoo match the records correctly during import. Without these IDs, Odoo may assign the current user as the customer and ignore order lines. When editing the file, make sure each order line is on a separate row with the same Sales Order ID. This ensures discounts, customer details, and product lines are preserved when re-imported.

Hope it helps