**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.


picking_type_obj = self.pool.get('stock.picking.type')
        pull_obj = self.pool.get('procurement.rule')
        push_obj = self.pool.get('stock.location.path')
        route_obj = self.pool.get('stock.location.route')
        new_reception_step = new_reception_step or warehouse.reception_steps
        new_delivery_step = new_delivery_step or warehouse.delivery_steps
        
        input_loc = warehouse.wh_input_stock_loc_id
        if new_reception_step == 'one_step':
            input_loc = warehouse.lot_stock_id
        output_loc = warehouse.wh_output_stock_loc_id
        if new_delivery_step == 'ship_only':
            output_loc = warehouse.lot_stock_id
        picking_type_obj.write(cr, uid, warehouse.in_type_id.id, {'default_location_dest_id': input_loc.id}, context=context)
        picking_type_obj.write(cr, uid, warehouse.out_type_id.id, {'default_location_src_id': output_loc.id}, context=context)
        picking_type_obj.write(cr, uid, warehouse.pick_type_id.id, {
                'active': new_delivery_step != 'ship_only',
                'default_location_dest_id': output_loc.id if new_delivery_step == 'pick_ship' else warehouse.wh_pack_stock_loc_id.id,
            }, context=context)