Thanks,  I think what the issue is material reservation is set to manual. I did this because we change schedule so often that the auto reservation wouldn't allow me to take products already allocated.  If I mass close MO's the reservation step does not happen.  When I do the reservations tep this never happens.  There is an option in the menu to unreserve but there is no option to reserve so I have to go through them 1 by 1 when closing MO's.

Hi,

This issue occurs because Odoo defaults to taking materials from the source location defined in the product’s Bill of Materials (BoM) or routing, which is often WH/Stock. When a component is actually stored in a sublocation such as WH/Stock/10/S1, Odoo doesn’t automatically detect this and still deducts stock from the default source. This results in correct total inventory but incorrect balances between sublocations, often leaving negatives in the parent location.

To fix this, review your BoM and Routing configurations to ensure the source location is not locked to a single area unless necessary. Enable Pre-fill Operations and Detailed Operations in Manufacturing settings so Odoo generates pickings that show actual component locations, allowing you to confirm or adjust them before marking a Manufacturing Order (MO) as done. Also, ensure your Operation Type has an appropriate Reservation Method (e.g., “At confirmation”) so materials are reserved from where they actually exist.

You can further improve accuracy by setting a Removal Strategy such as FIFO on your warehouse locations so Odoo automatically chooses the correct sublocation based on stock availability. For products always stored in a specific bin, define a Default Location or a Route that pulls directly from that sublocation. After applying these settings, future MOs will automatically consume components from the correct places without manual stock corrections.

Hope it helps