**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
return quant.product_id.standard_price * quant.qty
    _columns = {
        'name': fields.function(_get_quant_name, type='char', string='Identifier'),
        'product_id': fields.many2one('product.product', 'Product', required=True, ondelete="restrict", readonly=True, select=True),
        'location_id': fields.many2one('stock.location', 'Location', required=True, ondelete="restrict", readonly=True, select=True, auto_join=True),
        'qty': fields.float('Quantity', required=True, help="Quantity of products in this quant, in the default unit of measure of the product", readonly=True, select=True),
        'package_id': fields.many2one('stock.quant.package', string='Package', help="The package containing this quant", readonly=True, select=True),
        'packaging_type_id': fields.related('package_id', 'packaging_id', type='many2one', relation='product.packaging', string='Type of packaging', readonly=True, store=True),
        'reservation_id': fields.many2one('stock.move', 'Reserved for Move', help="The move the quant is reserved for", readonly=True, select=True),
        'lot_id': fields.many2one('stock.production.lot', 'Lot', readonly=True, select=True, ondelete="restrict"),
        'cost': fields.float('Unit Cost'),
        'owner_id': fields.many2one('res.partner', 'Owner', help="This is the owner of the quant", readonly=True, select=True),
        'create_date': fields.datetime('Creation Date', readonly=True),
        'in_date': fields.datetime('Incoming Date', readonly=True, select=True),
        'history_ids': fields.many2many('stock.move', 'stock_quant_move_rel', 'quant_id', 'move_id', 'Moves', help='Moves that operate(d) on this quant', copy=False),
        'company_id': fields.many2one('res.company', 'Company', help="The company to which the quants belong", required=True, readonly=True, select=True),
        'inventory_value': fields.function(_calc_inventory_value, string="Inventory Value", type='float', readonly=True),
        
        'propagated_from_id': fields.many2one('stock.quant', 'Linked Quant', help='The negative quant this is coming from', readonly=True, select=True),
        'negative_move_id': fields.many2one('stock.move', 'Move Negative Quant', help='If this is a negative quant, this will be the move that caused this negative quant.', readonly=True),
        'negative_dest_location_id': fields.related('negative_move_id', 'location_dest_id', type='many2one', relation='stock.location', string="Negative Destination Location", readonly=True, 
                                                    help="Technical field used to record the destination location of a move that created a negative quant"),
    }
    _defaults = {
        'company_id': lambda self, cr, uid, c: self.pool.get('res.company')._company_default_get(cr, uid, 'stock.quant', context=c),
    }
    def init(self, cr):