**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
act_obj = self.pool.get('ir.actions.act_window')
        mod_obj = self.pool.get('ir.model.data')
        proc_ids = self.pool.get('procurement.order').search(cr, uid, [('orderpoint_id', 'in', ids), ('state', 'not in', ('done', 'cancel'))], context=context)
        result = mod_obj.get_object_reference(cr, uid, 'procurement', 'do_view_procurements')
        if not result:
            return False
        result = act_obj.read(cr, uid, [result[1]], context=context)[0]
        result['domain'] = "[('id', 'in', [" + ','.join(map(str, proc_ids)) + "])]"
        return result
    _columns = {
        'name': fields.char('Name', required=True, copy=False),
        'active': fields.boolean('Active', help="If the active field is set to False, it will allow you to hide the orderpoint without removing it."),
        'logic': fields.selection([('max', 'Order to Max'), ('price', 'Best price (not yet active!)')], 'Reordering Mode', required=True),
        'warehouse_id': fields.many2one('stock.warehouse', 'Warehouse', required=True, ondelete="cascade"),
        'location_id': fields.many2one('stock.location', 'Location', required=True, ondelete="cascade"),
        'product_id': fields.many2one('product.product', 'Product', required=True, ondelete='cascade', domain=[('type', '=', 'product')]),
        'product_uom': fields.related('product_id', 'uom_id', type='many2one', relation='product.uom', string='Product Unit of Measure', readonly=True, required=True),
        'product_min_qty': fields.float('Minimum Quantity', required=True,
            digits_compute=dp.get_precision('Product Unit of Measure'),
            help="When the virtual stock goes below the Min Quantity specified for this field, Odoo generates "\
            "a procurement to bring the forecasted quantity to the Max Quantity."),
        'product_max_qty': fields.float('Maximum Quantity', required=True,
            digits_compute=dp.get_precision('Product Unit of Measure'),
            help="When the virtual stock goes below the Min Quantity, Odoo generates "\
            "a procurement to bring the forecasted quantity to the Quantity specified as Max Quantity."),
        'qty_multiple': fields.float('Qty Multiple', required=True,
            digits_compute=dp.get_precision('Product Unit of Measure'),