Origianl code :

class Inventory(models.Model):
_name = "stock.inventory"
_description = "Inventory"
_order = "date desc, id desc"

@api.model
def _default_location_id(self):
company_user = self.env.user.company_id
warehouse = self.env['stock.warehouse'].search([('company_id', '=', company_user.id)], limit=1)
if warehouse:
return warehouse.lot_stock_id.id
else:
raise UserError(_('You must define a warehouse for the company: %s.') % (company_user.name,))

My overriding :

class Inventory(models.Model):
_inherit = 'stock.inventory'

print("test")
@api.model
def _default_location_id(self):
print("pass")
res = super(Inventory, self)._default_location_id()
if self.env.user.context_default_warehouse_id:
res['location_id'] = self.env.user.context_default_warehouse_id.\
lot_stock_id.id
return res

I don't understand why it didn't work !