**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
'qty_done': fields.float('Quantity Processed', digits_compute=dp.get_precision('Product Unit of Measure')),
        'package_id': fields.many2one('stock.quant.package', 'Source Package'),  
        'lot_id': fields.many2one('stock.production.lot', 'Lot/Serial Number'),
        'result_package_id': fields.many2one('stock.quant.package', 'Destination Package', help="If set, the operations are packed into this package", required=False, ondelete='cascade'),
        'date': fields.datetime('Date', required=True),
        'owner_id': fields.many2one('res.partner', 'Owner', help="Owner of the quants"),
        
        'cost': fields.float("Cost", help="Unit Cost for this product line"),
        'currency': fields.many2one('res.currency', string="Currency", help="Currency in which Unit cost is expressed", ondelete='CASCADE'),
        'linked_move_operation_ids': fields.one2many('stock.move.operation.link', 'operation_id', string='Linked Moves', readonly=True, help='Moves impacted by this operation for the computation of the remaining quantities'),
        'remaining_qty': fields.function(_get_remaining_qty, type='float', digits = 0, string="Remaining Qty", help="Remaining quantity in default UoM according to moves matched with this operation. "),
        'location_id': fields.many2one('stock.location', 'Source Location', required=True),
        'location_dest_id': fields.many2one('stock.location', 'Destination Location', required=True),
        'processed': fields.selection([('true','Yes'), ('false','No')],'Has been processed?', required=True),
    }
    _defaults = {
        'date': fields.date.context_today,
        'qty_done': 0,
        'processed': lambda *a: 'false',
    }
    def write(self, cr, uid, ids, vals, context=None):
        context = context or {}
        res = super(stock_pack_operation, self).write(cr, uid, ids, vals, context=context)
        if isinstance(ids, (int, long)):
            ids = [ids]
        if not context.get("no_recompute"):
            pickings = vals.get('picking_id') and [vals['picking_id']] or list(set([x.picking_id.id for x in self.browse(cr, uid, ids, context=context)]))
            self.pool.get("stock.picking").do_recompute_remaining_quantities(cr, uid, pickings, context=context)
        return res
    def create(self, cr, uid, vals, context=None):