**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 the company owning the location if any '''
        return location and (location.usage == 'internal') and location.company_id or False
    def _complete_name(self, cr, uid, ids, name, args, context=None):
        """ Forms complete name of location from parent location to child location.
        @return: Dictionary of values
        """
        res = {}
        for m in self.browse(cr, uid, ids, context=context):
            res[m.id] = m.name
            parent = m.location_id
            while parent:
                res[m.id] = parent.name + ' / ' + res[m.id]
                parent = parent.location_id
        return res
    def _get_sublocations(self, cr, uid, ids, context=None):
        """ return all sublocations of the given stock locations (included) """
        if context is None:
            context = {}
        context_with_inactive = context.copy()
        context_with_inactive['active_test'] = False
        return self.search(cr, uid, [('id', 'child_of', ids)], context=context_with_inactive)
    def _name_get(self, cr, uid, location, context=None):