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 


""" Test that editing a done stock move line linked to an owned product correctly and directly
        adapts the transfer. In this case, we edit the owner to another available one.
        """
        owner1 = self.env['res.partner'].create({'name': 'test_edit_reserved_move_line_4_1'})
        owner2 = self.env['res.partner'].create({'name': 'test_edit_reserved_move_line_4_2'})
        self.env['stock.quant']._update_available_quantity(self.product1, self.stock_location, 1.0, owner_id=owner1)
        self.env['stock.quant']._update_available_quantity(self.product1, self.stock_location, 1.0, owner_id=owner2)
        self.assertEqual(self.env['stock.quant']._get_available_quantity(self.product1, self.stock_location), 2.0)
        self.assertEqual(self.env['stock.quant']._get_available_quantity(self.product1, self.stock_location, owner_id=owner1), 1.0)
        self.assertEqual(self.env['stock.quant']._get_available_quantity(self.product1, self.stock_location, owner_id=owner2), 1.0)
        move1 = self.env['stock.move'].create({
            'name': 'test_edit_moveline_1',
            'location_id': self.stock_location.id,
            'location_dest_id': self.customer_location.id,
            'product_id': self.product1.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._action_done()
        self.assertEqual(self.env['stock.quant']._get_available_quantity(self.product1, self.stock_location), 1.0)
        self.assertEqual(self.env['stock.quant']._get_available_quantity(self.product1, self.stock_location, owner_id=owner1), 0.0)
        self.assertEqual(self.env['stock.quant']._get_available_quantity(self.product1, self.stock_location, owner_id=owner2), 1.0)
        move1.move_line_ids.owner_id = owner2.id
        self.assertEqual(self.env['stock.quant']._get_available_quantity(self.product1, self.stock_location), 1.0)
        self.assertEqual(self.env['stock.quant']._get_available_quantity(self.product1, self.stock_location, owner_id=owner1), 1.0)
        self.assertEqual(self.env['stock.quant']._get_available_quantity(self.product1, self.stock_location, owner_id=owner2), 0.0)
    def test_edit_done_move_line_5(self):