**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
""" Create a package with the current pack_operation_ids of the picking that aren't yet in a pack.
        Used in the barcode scanner UI and the normal interface as well. 
        operation_filter_ids is used by barcode scanner interface to specify a subset of operation to pack"""
        if operation_filter_ids == None:
            operation_filter_ids = []
        stock_operation_obj = self.pool.get('stock.pack.operation')
        package_obj = self.pool.get('stock.quant.package')
        stock_move_obj = self.pool.get('stock.move')
        package_id = False
        for picking_id in picking_ids:
            operation_search_domain = [('picking_id', '=', picking_id), ('result_package_id', '=', False)]
            if operation_filter_ids != []:
                operation_search_domain.append(('id', 'in', operation_filter_ids))
            operation_ids = stock_operation_obj.search(cr, uid, operation_search_domain, context=context)
            pack_operation_ids = []
            if operation_ids:
                for operation in stock_operation_obj.browse(cr, uid, operation_ids, context=context):
                    
                    op = operation
                    if (operation.qty_done < operation.product_qty):
                        new_operation = stock_operation_obj.copy(cr, uid, operation.id, {'product_qty': operation.qty_done,'qty_done': operation.qty_done}, context=context)
                        stock_operation_obj.write(cr, uid, operation.id, {'product_qty': operation.product_qty - operation.qty_done,'qty_done': 0}, context=context)
                        op = stock_operation_obj.browse(cr, uid, new_operation, context=context)
                    pack_operation_ids.append(op.id)
                    if op.product_id and op.location_id and op.location_dest_id:
                        stock_move_obj.check_tracking_product(cr, uid, op.product_id, op.lot_id.id, op.location_id, op.location_dest_id, context=context)
                package_id = package_obj.create(cr, uid, {}, context=context)
                stock_operation_obj.write(cr, uid, pack_operation_ids, {'result_package_id': package_id}, context=context)
        return package_id
    def process_product_id_from_ui(self, cr, uid, picking_id, product_id, op_id, increment=True, context=None):