**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.


pull_obj = self.pool['procurement.rule']
        push_obj = self.pool['stock.location.path']
        pulls = pull_obj.search(cr, uid, ['&', ('route_id', 'not in', [x.id for x in warehouse.route_ids]), '|', ('location_src_id', '=', location_id), ('location_id', '=', location_id)], context=context)
        pushs = push_obj.search(cr, uid, ['&', ('route_id', 'not in', [x.id for x in warehouse.route_ids]), '|', ('location_from_id', '=', location_id), ('location_dest_id', '=', location_id)], context=context)
        if pulls or pushs:
            return True
        return False
    def switch_location(self, cr, uid, ids, warehouse, new_reception_step=False, new_delivery_step=False, context=None):
        location_obj = self.pool.get('stock.location')
        new_reception_step = new_reception_step or warehouse.reception_steps
        new_delivery_step = new_delivery_step or warehouse.delivery_steps
        if warehouse.reception_steps != new_reception_step:
            if not self._location_used(cr, uid, warehouse.wh_input_stock_loc_id.id, warehouse, context=context):
                location_obj.write(cr, uid, [warehouse.wh_input_stock_loc_id.id, warehouse.wh_qc_stock_loc_id.id], {'active': False}, context=context)
            if new_reception_step != 'one_step':
                location_obj.write(cr, uid, warehouse.wh_input_stock_loc_id.id, {'active': True}, context=context)
            if new_reception_step == 'three_steps':
                location_obj.write(cr, uid, warehouse.wh_qc_stock_loc_id.id, {'active': True}, context=context)
        if warehouse.delivery_steps != new_delivery_step:
            if not self._location_used(cr, uid, warehouse.wh_output_stock_loc_id.id, warehouse, context=context):
                location_obj.write(cr, uid, [warehouse.wh_output_stock_loc_id.id], {'active': False}, context=context)
            if not self._location_used(cr, uid, warehouse.wh_pack_stock_loc_id.id, warehouse, context=context):
                location_obj.write(cr, uid, [warehouse.wh_pack_stock_loc_id.id], {'active': False}, context=context)
            if new_delivery_step != 'ship_only':
                location_obj.write(cr, uid, warehouse.wh_output_stock_loc_id.id, {'active': True}, context=context)
            if new_delivery_step == 'pick_pack_ship':
                location_obj.write(cr, uid, warehouse.wh_pack_stock_loc_id.id, {'active': True}, context=context)
        return True
    def _get_reception_delivery_route(self, cr, uid, warehouse, route_name, context=None):