Hi,

To correct an incorrect opening balance for spare parts in Odoo after data migration, start by capturing the current inventory state with an inventory valuation report. Determine the correct unit costs and quantities from your historical records. If you've recorded transactions after the incorrect import, consider reversing them, but be mindful of the impact.

Create an inventory adjustment, entering the correct opening quantity in the "Counted Quantity" field and the correct total value in the "New Value" column. Validate the adjustment, and then review the inventory valuation report to confirm the correction. If you reversed transactions, re-enter them. Be aware of accounting periods, review journal entries, and ensure you have proper user permissions. Always back up your database and test in a staging environment. Consult with an accountant to ensure compliance with accounting standards. If you have few transactions, you might adjust the inventory directly, but this could slightly affect COGS accuracy.

Hope it helps