**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
uom_obj = self.pool.get('product.uom')
        res = dict.fromkeys(ids, '')
        precision = self.pool['decimal.precision'].precision_get(cr, uid, 'Product Unit of Measure')
        for move in self.browse(cr, uid, ids, context=context):
            if move.state in ('draft', 'done', 'cancel') or move.location_id.usage != 'internal':
                res[move.id] = ''  
                continue
            total_available = min(move.product_qty, move.reserved_availability + move.availability)
            total_available = uom_obj._compute_qty_obj(cr, uid, move.product_id.uom_id, total_available, move.product_uom, round=False, context=context)
            total_available = float_round(total_available, precision_digits=precision)
            info = str(total_available)
            
            if self.pool.get('res.users').has_group(cr, uid, 'product.group_uom'):
                info += ' ' + move.product_uom.name
            if move.reserved_availability:
                if move.reserved_availability != total_available:
                    
                    reserved_available = uom_obj._compute_qty_obj(cr, uid, move.product_id.uom_id, move.reserved_availability, move.product_uom, round=False, context=context)
                    reserved_available = float_round(reserved_available, precision_digits=precision)
                    info += _(' (%s reserved)') % str(reserved_available)
                else:
                    
                    info += _(' (reserved)')
            res[move.id] = info
        return res
    def _get_reserved_availability(self, cr, uid, ids, field_name, args, context=None):