**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.


operations = set()
        for move in self.browse(cr, uid, ids, context=context):
            if move.state not in ('confirmed', 'waiting', 'assigned'):
                continue
            if move.location_id.usage in ('supplier', 'inventory', 'production'):
                to_assign_moves.add(move.id)
                
                if not move.origin_returned_move_id:
                    continue
            if move.product_id.type == 'consu':
                to_assign_moves.add(move.id)
                continue
            else:
                todo_moves.append(move)
                
                main_domain[move.id] = [('reservation_id', '=', False), ('qty', '>', 0)]
                
                ancestors = self.find_move_ancestors(cr, uid, move, context=context)
                if move.state == 'waiting' and not ancestors:
                    
                    main_domain[move.id] += [('id', '=', False)]
                elif ancestors:
                    main_domain[move.id] += [('history_ids', 'in', ancestors)]
                
                if move.origin_returned_move_id:
                    main_domain[move.id] += [('history_ids', 'in', move.origin_returned_move_id.id)]
                for link in move.linked_move_operation_ids:
                    operations.add(link.operation_id)
        
        operations = list(operations)