Impacted versions:
11.0

I don't know if it is an issue, but I think is strange.

`product_qty` is in unit of `product` : https://github.com/odoo/odoo/blob/11.0/addons/stock/models/stock_move.py#L240
`reserved_availability` is in unit of `stock.move` : https://github.com/odoo/odoo/blob/11.0/addons/stock/models/stock_move.py#L295

`move.product_qty - move.reserved_availability` seems to have no sens, no ?

https://github.com/odoo/odoo/blob/11.0/addons/stock/models/stock_move.py#L915
https://github.com/odoo/odoo/blob/11.0/addons/stock/models/stock_move.py#L917
https://github.com/odoo/odoo/blob/11.0/addons/stock/models/stock_move.py#L924

thank for your answer

@jco-odoo 
@alnslang 


'name': 'lot1',
            'product_id': self.product1.id,
        })
        lot2 = self.env['stock.production.lot'].create({
            'name': 'lot2',
            'product_id': self.product1.id,
        })
        package1 = self.env['stock.quant.package'].create({'name': 'test_edit_reserved_move_line_5'})
        move1 = self.env['stock.move'].create({
            'name': 'test_edit_moveline_1',
            'location_id': self.supplier_location.id,
            'location_dest_id': self.stock_location.id,
            'product_id': self.product3.id,
            'product_uom': self.uom_unit.id,
            'product_uom_qty': 1.0,
        })
        move1._action_confirm()
        move1._action_assign()
        move1.move_line_ids.qty_done = 1
        move1.move_line_ids.lot_id = lot1.id
        move1.move_line_ids.result_package_id = package1.id
        move1._action_done()
        self.assertEqual(self.env['stock.quant']._get_available_quantity(self.product3, self.stock_location), 1.0)
        self.assertEqual(self.env['stock.quant']._get_available_quantity(self.product3, self.stock_location, lot_id=lot1, package_id=package1), 1.0)
        move1.move_line_ids.write({'lot_id': lot2.id})
        self.assertEqual(self.env['stock.quant']._get_available_quantity(self.product3, self.stock_location), 1.0)
        self.assertEqual(self.env['stock.quant']._get_available_quantity(self.product3, self.stock_location, lot_id=lot1), 0.0)
        self.assertEqual(self.env['stock.quant']._get_available_quantity(self.product3, self.stock_location, lot_id=lot1, package_id=package1), 0.0)
        self.assertEqual(self.env['stock.quant']._get_available_quantity(self.product3, self.stock_location, lot_id=lot2, package_id=package1), 1.0)
    def test_immediate_validate_1(self):