I have set up a new instance of Odoo 18 Community.  I am trying to import initial inventory quantities using the Physical Inventory option  (inventory adjustments).  I successfully imported the quantities and am now trying to apply the adjustments.

When I use the Apply option, a Validation Error occurs:

The operation cannot be completed... a mandatory field is not set.
Model: Stock Move (stock.move)
field: Source Location (location_id)

I have turned on Storage Locations. I have manually created a Virtual Locations/Inventory adjustment location (which was not created by default).  I cannot see any other thing that might be missing.  But I still get this error when trying to adjust the on hand quantity.

The same error occurs if I display the product and use the Update Quantity option for that product.

Has anyone else run into this? Is there some other config/setup that I am missing to get this working?

Thanks in advance.

Chris