**Impacted versions:** 8.0

**Steps to reproduce:**
To reproduce it is necessary the fifo configuration in the assignation of quants in moves.

- Create a sale order with two lines of the same product, one of that line with a route that generate moves between warehouse.

<img width="1231" alt="skitch 65" src="https://cloud.githubusercontent.com/assets/11341058/24102907/d575a638-0d53-11e7-922e-a3f034d43e94.png">

The route used has three pull rules:

1. From Stock Warehouse_1 to Virtual Locations/Inter Company Transit
2. From Virtual Locations/Inter Company Transit to Stock Warehouse_2
3. From Stock Warehouse_2 to Customers

<img width="1224" alt="skitch 66" src="https://cloud.githubusercontent.com/assets/11341058/24103147/b7c2bfbc-0d54-11e7-955c-87247a10e0bd.png">

- Confirm the sale order. It must be created three pickings:

<img width="1226" alt="skitch 67" src="https://cloud.githubusercontent.com/assets/11341058/24103498/d90c9b38-0d55-11e7-97ff-f986df8cdd9b.png">

- Transfer first two pickings.

<img width="1230" alt="skitch 70" src="https://cloud.githubusercontent.com/assets/11341058/24104496/b7b0be8a-0d58-11e7-89a2-4331fceec1d8.png">

- Before transfer third picking, review that one move has reserved the quant correctly because was reserved from the previous pickings.

<img width="1215" alt="skitch 68" src="https://cloud.githubusercontent.com/assets/11341058/24103908/23952cc8-0d57-11e7-9346-bd48d7edb54a.png">

**Current behavior:**

When check availability of this third picking, the quant already reserved is moved to the other move.

<img width="1264" alt="skitch 69" src="https://cloud.githubusercontent.com/assets/11341058/24104056/8be11616-0d57-11e7-8763-a90507315b19.png">
 
**Expected behavior:**

When check availability of this third picking, the moves already reserved must not be altered.


addons/stock/stock.py
'code': fields.selection([('incoming', 'Suppliers'), ('outgoing', 'Customers'), ('internal', 'Internal')], 'Type of Operation', required=True),
        'return_picking_type_id': fields.many2one('stock.picking.type', 'Picking Type for Returns'),
        'warehouse_id': fields.many2one('stock.warehouse', 'Warehouse', ondelete='cascade'),
        'active': fields.boolean('Active'),
        
        'last_done_picking': fields.function(_get_tristate_values,
            type='char',
            string='Last 10 Done Pickings'),
        'count_picking_draft': fields.function(_get_picking_count,
            type='integer', multi='_get_picking_count'),
        'count_picking_ready': fields.function(_get_picking_count,
            type='integer', multi='_get_picking_count'),
        'count_picking': fields.function(_get_picking_count,
            type='integer', multi='_get_picking_count'),
        'count_picking_waiting': fields.function(_get_picking_count,
            type='integer', multi='_get_picking_count'),
        'count_picking_late': fields.function(_get_picking_count,
            type='integer', multi='_get_picking_count'),
        'count_picking_backorders': fields.function(_get_picking_count,
            type='integer', multi='_get_picking_count'),
        'rate_picking_late': fields.function(_get_picking_count,
            type='integer', multi='_get_picking_count'),
        'rate_picking_backorders': fields.function(_get_picking_count,
            type='integer', multi='_get_picking_count'),
    }
    _defaults = {
        'warehouse_id': _default_warehouse,
        'active': True,
    }