**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
[('state', 'not in', ('done', 'cancel')), ('picking_type_id', 'in', ids)],
                ['picking_type_id'], ['picking_type_id'], context=context)
            count = dict(map(lambda x: (x['picking_type_id'] and x['picking_type_id'][0], x['picking_type_id_count']), data))
            for tid in ids:
                result.setdefault(tid, {})[field] = count.get(tid, 0)
        for tid in ids:
            if result[tid]['count_picking']:
                result[tid]['rate_picking_late'] = result[tid]['count_picking_late'] * 100 / result[tid]['count_picking']
                result[tid]['rate_picking_backorders'] = result[tid]['count_picking_backorders'] * 100 / result[tid]['count_picking']
            else:
                result[tid]['rate_picking_late'] = 0
                result[tid]['rate_picking_backorders'] = 0
        return result
    def onchange_picking_code(self, cr, uid, ids, picking_code=False):
        if not picking_code:
            return False
        
        obj_data = self.pool.get('ir.model.data')
        stock_loc = obj_data.xmlid_to_res_id(cr, uid, 'stock.stock_location_stock')
        
        result = {
            'default_location_src_id': stock_loc,
            'default_location_dest_id': stock_loc,
        }
        if picking_code == 'incoming':
            result['default_location_src_id'] = obj_data.xmlid_to_res_id(cr, uid, 'stock.stock_location_suppliers')
        elif picking_code == 'outgoing':
            result['default_location_dest_id'] = obj_data.xmlid_to_res_id(cr, uid, 'stock.stock_location_customers')
        return {'value': result}
    def _get_name(self, cr, uid, ids, field_names, arg, context=None):