Hi,

In Odoo 15 Manufacturing, the system automatically checks the availability of raw materials when you confirm a Manufacturing Order (MO). It updates the MO status based on availability:

    "Waiting for Components" if some or all materials are not available

    "Ready" when all required components are available and reserved

However, Odoo does not block the MO from proceeding if materials are missing. It allows you to force production, which can lead to negative inventory if the components haven't been received into stock yet.

To prevent MOs from being processed without materials:

You’ll need to customize the system, for example:

    Add a condition that prevents validation or production start unless the MO state is "Ready" (i.e., all materials are available and reserved).

    Raise a warning or block the button action in the backend using a custom method override on the mrp.production model.

Hope it helps