**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.


'default_location_src_id': wh_stock_loc.id,
            'default_location_dest_id': wh_stock_loc.id,
            'active': True,
            'sequence': max_sequence + 2,
            'color': color}, context=context)
        pack_type_id = picking_type_obj.create(cr, uid, vals={
            'name': _('Pack'),
            'warehouse_id': warehouse.id,
            'code': 'internal',
            'sequence_id': pack_seq_id,
            'default_location_src_id': wh_pack_stock_loc.id,
            'default_location_dest_id': output_loc.id,
            'active': warehouse.delivery_steps == 'pick_pack_ship',
            'sequence': max_sequence + 3,
            'color': color}, context=context)
        pick_type_id = picking_type_obj.create(cr, uid, vals={
            'name': _('Pick'),
            'warehouse_id': warehouse.id,
            'code': 'internal',
            'sequence_id': pick_seq_id,
            'default_location_src_id': wh_stock_loc.id,
            'default_location_dest_id': output_loc.id if warehouse.delivery_steps == 'pick_ship' else wh_pack_stock_loc.id,
            'active': warehouse.delivery_steps != 'ship_only',
            'sequence': max_sequence + 2,
            'color': color}, context=context)
        
        vals = {
            'in_type_id': in_type_id,
            'out_type_id': out_type_id,
            'pack_type_id': pack_type_id,