**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.


store={
                'stock.location.route': (_get_rules, ['sequence'], 10),
                'stock.location.path': (lambda self, cr, uid, ids, c={}: ids, ['route_id'], 10),
        }),
        'sequence': fields.integer('Sequence'),
    }
    _defaults = {
        'auto': 'auto',
        'delay': 0,
        'company_id': lambda self, cr, uid, c: self.pool.get('res.company')._company_default_get(cr, uid, 'procurement.order', context=c),
        'propagate': True,
        'active': True,
    }
    def _prepare_push_apply(self, cr, uid, rule, move, context=None):
        newdate = (datetime.strptime(move.date_expected, DEFAULT_SERVER_DATETIME_FORMAT) + relativedelta.relativedelta(days=rule.delay or 0)).strftime(DEFAULT_SERVER_DATETIME_FORMAT)
        return {
                'origin': move.origin or move.picking_id.name or "/",
                'location_id': move.location_dest_id.id,
                'location_dest_id': rule.location_dest_id.id,
                'date': newdate,
                'company_id': rule.company_id and rule.company_id.id or False,
                'date_expected': newdate,
                'picking_id': False,
                'picking_type_id': rule.picking_type_id and rule.picking_type_id.id or False,
                'propagate': rule.propagate,
                'push_rule_id': rule.id,
                'warehouse_id': rule.warehouse_id and rule.warehouse_id.id or False,
                'procurement_id': False,
            }
    def _apply(self, cr, uid, rule, move, context=None):