Hello GGWP,

As per your comment, I am not clear on much but, I can explain how inventory reports work.

Inventory Report. (stock. quant)
stock quant has no relation with move or move line.
In every transaction when the moving line is done or updated then quant is updated or created.
updated -

if the move line has matched with product_id, company_id, location_id, lot_id, package_id, owner_id, in_date(in quant) then that move line is merged in that quant.

if the parameter is not matched exactly then-new quant is created.

@api.onchange('tracking')
def onchange_tracking(self):
some code here
'message': _("You have product(s) in stock that have no lot/serial number. You can assign lot/serial numbers by doing an inventory adjustment.")}}

Import point - when you try to change Product tracking and if the product has a lot and serial number and if quant exists with this product and lot/serial number then the system will warn (miss-matched quant will occur Noted it.)

Thanks & Regards,

Email: odoo@aktivsoftware.com

Skype: kalpeshmaheshwari