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 


addons/stock/tests/test_move.py
move1._action_confirm()
        self.assertEqual(move1.state, 'confirmed')
        
        move1._action_assign()
        self.assertEqual(move1.state, 'assigned')
        self.assertEqual(len(move1.move_line_ids), 5)
        move_line = move1.move_line_ids[0]
        self.assertEqual(move1.reserved_availability, 5)
        i = 0
        for move_line in move1.move_line_ids:
            move_line.lot_name = 'sn%s' % i
            move_line.qty_done = 1
            i += 1
        self.assertEqual(move1.quantity_done, 5.0)
        self.assertEqual(move1.product_qty, 5)  
        move1._action_done()
        self.assertEqual(move1.quantity_done, 5.0)
        self.assertEqual(move1.product_qty, 5)  
        self.assertEqual(move1.state, 'done')
        
        self.assertEqual(self.env['stock.quant']._get_available_quantity(self.product2, self.supplier_location), 0.0)
        supplier_quants = self.env['stock.quant']._gather(self.product2, self.supplier_location)
        self.assertEqual(sum(supplier_quants.mapped('quantity')), -5.0)
        self.assertEqual(self.env['stock.quant']._get_available_quantity(self.product2, self.stock_location), 5.0)
        self.assertEqual(len(self.env['stock.quant']._gather(self.product2, self.supplier_location)), 5.0)
        quants = self.env['stock.quant']._gather(self.product2, self.stock_location)
        self.assertEqual(len(quants), 5.0)
        for quant in quants:
            self.assertNotEqual(quant.in_date, False)
    def test_out_1(self):