Hi,

    Raw Material Cost Mistake

    A wrong cost was entered for a raw material, which affected the cost of finished goods during manufacturing.

    Raw Material Cost Fixed

    You corrected the cost and re-added the raw material — its valuation is now correct.

    Finished Goods Still Show Old Cost

    Even after fixing the raw material, the finished goods are still valued using the earlier incorrect cost.

    Manufacturing Already Completed

    Since the Manufacturing Order is done, the system already recorded the finished goods valuation at that time.

    How to Correct Finished Goods Value

    You can fix this by adding a manual accounting journal entry to reflect the correct valuation difference.

    Optional – Cancel and Redo MO

    If allowed, you can cancel the MO, return materials, fix the cost, and create a new MO with the correct values.

    Alternative – Inventory Adjustment

    Adjust finished goods stock: remove the product at the old cost and re-add it at the corrected value (use with care to keep stock and cost accurate).

    Prevent Future Issues

    Always review and confirm raw material costs before starting any production, and limit who can change product costs.

    For more details about inventory valuation in odoo14 refer this blog-https://www.cybrosys.com/blog/inventory-valuation-in-odoo-14

Hope it helps.