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 


move3._action_done()
        quant_in_pack = self.env['stock.quant'].search([
            ('product_id', '=', self.product3.id),
            ('location_id', '=', self.pack_location.id),
        ])
        
        
        self.assertEqual(len(quant_in_pack), 1)
        from odoo.fields import Datetime
        self.assertEqual(quant_in_pack.in_date, Datetime.to_string(initial_in_date_lot1))
        self.assertEqual(quant_in_pack.lot_id, lot1)
        
        move3.move_line_ids.lot_id = lot2
        
        quant_lot1 = self.env['stock.quant'].search([
            ('location_id.usage', '=', 'internal'),
            ('product_id', '=', self.product3.id),
            ('lot_id', '=', lot1.id),
        ])
        self.assertEqual(quant_lot1.location_id, self.stock_location)
        self.assertEqual(quant_lot1.in_date, Datetime.to_string(initial_in_date_lot1))
        
        quant_lot2 = self.env['stock.quant'].search([
            ('location_id.usage', '=', 'internal'),
            ('product_id', '=', self.product3.id),
            ('lot_id', '=', lot2.id),
        ])
        self.assertEqual(quant_lot2.location_id, self.pack_location)
        self.assertEqual(quant_lot2.in_date, initial_in_date_lot2)
    def test_in_date_3(self):