**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
delivery_route_id = route_obj.create(cr, uid, route_vals, context=context)
        wh_route_ids.append((4, delivery_route_id))
        dummy, pull_rules_list = self._get_push_pull_rules(cr, uid, warehouse, True, values, delivery_route_id, context=context)
        for pull_rule in pull_rules_list:
            pull_obj.create(cr, uid, vals=pull_rule, context=context)
        
        mto_pull_vals = self._get_mto_pull_rule(cr, uid, warehouse, values, context=context)[0]
        mto_pull_id = pull_obj.create(cr, uid, mto_pull_vals, context=context)
        
        route_name, values = routes_dict['crossdock']
        crossdock_route_vals = self._get_crossdock_route(cr, uid, warehouse, route_name, context=context)
        crossdock_route_id = route_obj.create(cr, uid, vals=crossdock_route_vals, context=context)
        wh_route_ids.append((4, crossdock_route_id))
        dummy, pull_rules_list = self._get_push_pull_rules(cr, uid, warehouse, warehouse.delivery_steps != 'ship_only' and warehouse.reception_steps != 'one_step', values, crossdock_route_id, context=context)
        for pull_rule in pull_rules_list:
            
            pull_rule['procure_method'] = 'make_to_order'
            pull_obj.create(cr, uid, vals=pull_rule, context=context)
        
        self._create_resupply_routes(cr, uid, warehouse, warehouse.resupply_wh_ids, warehouse.default_resupply_wh_id, context=context)
        
        return {
            'route_ids': wh_route_ids,
            'mto_pull_id': mto_pull_id,
            'reception_route_id': reception_route_id,
            'delivery_route_id': delivery_route_id,
            'crossdock_route_id': crossdock_route_id,
        }
    def change_route(self, cr, uid, ids, warehouse, new_reception_step=False, new_delivery_step=False, context=None):