**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
try:
            warehouse = self.pool.get('ir.model.data').get_object(cr, uid, 'stock', 'warehouse0')
            return warehouse.lot_stock_id.id
        except:
            return False
    _defaults = {
        'date': fields.datetime.now,
        'state': 'draft',
        'company_id': lambda self, cr, uid, c: self.pool.get('res.company')._company_default_get(cr, uid, 'stock.inventory', context=c),
        'location_id': _default_stock_location,
        'filter': 'none',
    }
    def reset_real_qty(self, cr, uid, ids, context=None):
        inventory = self.browse(cr, uid, ids[0], context=context)
        line_ids = [line.id for line in inventory.line_ids]
        self.pool.get('stock.inventory.line').write(cr, uid, line_ids, {'product_qty': 0})
        return True
    def action_done(self, cr, uid, ids, context=None):
        """ Finish the inventory
        @return: True
        """
        for inv in self.browse(cr, uid, ids, context=context):
            for inventory_line in inv.line_ids:
                if inventory_line.product_qty < 0 and inventory_line.product_qty != inventory_line.theoretical_qty:
                    raise osv.except_osv(_('Warning'), _('You cannot set a negative product quantity in an inventory line:\n\t%s - qty: %s' % (inventory_line.product_id.name, inventory_line.product_qty)))
            self.action_check(cr, uid, [inv.id], context=context)
            self.write(cr, uid, [inv.id], {'state': 'done'}, context=context)
            self.post_inventory(cr, uid, inv, context=context)
        return True
    def post_inventory(self, cr, uid, inv, context=None):