**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.


return self.pool.get('stock.pack.operation')._search_and_increment(cr, uid, picking_id, [('product_id', '=', product_id),('id', '=', op_id)], increment=increment, context=context)
    def process_barcode_from_ui(self, cr, uid, picking_id, barcode_str, visible_op_ids, context=None):
        '''This function is called each time there barcode scanner reads an input'''
        lot_obj = self.pool.get('stock.production.lot')
        package_obj = self.pool.get('stock.quant.package')
        product_obj = self.pool.get('product.product')
        stock_operation_obj = self.pool.get('stock.pack.operation')
        stock_location_obj = self.pool.get('stock.location')
        answer = {'filter_loc': False, 'operation_id': False}
        
        matching_location_ids = stock_location_obj.search(cr, uid, [('loc_barcode', '=', barcode_str)], context=context)
        if matching_location_ids:
            
            location = stock_location_obj.browse(cr, uid, matching_location_ids[0], context=None)
            answer['filter_loc'] = stock_location_obj._name_get(cr, uid, location, context=None)
            answer['filter_loc_id'] = matching_location_ids[0]
            return answer
        
        matching_product_ids = product_obj.search(cr, uid, ['|', ('ean13', '=', barcode_str), ('default_code', '=', barcode_str)], context=context)
        if matching_product_ids:
            op_id = stock_operation_obj._search_and_increment(cr, uid, picking_id, [('product_id', '=', matching_product_ids[0])], filter_visible=True, visible_op_ids=visible_op_ids, increment=True, context=context)
            answer['operation_id'] = op_id
            return answer
        
        matching_lot_ids = lot_obj.search(cr, uid, [('name', '=', barcode_str)], context=context)
        if matching_lot_ids: