**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
return {}
    
    def on_change_product_id(self, cr, uid, ids, product, uom, theoretical_qty, context=None):
        """ Changes UoM
        @param location_id: Location id
        @param product: Changed product_id
        @param uom: UoM product
        @return:  Dictionary of changed values
        """
        if not product:
            return {'value': {'product_uom_id': False}}
        obj_product = self.pool.get('product.product').browse(cr, uid, product, context=context)
        return {'value': {'product_uom_id': uom or obj_product.uom_id.id}}
class stock_warehouse(osv.osv):
    _name = "stock.warehouse"
    _description = "Warehouse"
    _columns = {
        'name': fields.char('Warehouse Name', required=True, select=True),
        'company_id': fields.many2one('res.company', 'Company', required=True, readonly=True, select=True),
        'partner_id': fields.many2one('res.partner', 'Address'),
        'view_location_id': fields.many2one('stock.location', 'View Location', required=True, domain=[('usage', '=', 'view')]),
        'lot_stock_id': fields.many2one('stock.location', 'Location Stock', domain=[('usage', '=', 'internal')], required=True),
        'code': fields.char('Short Name', size=5, required=True, help="Short name used to identify your warehouse"),
        'route_ids': fields.many2many('stock.location.route', 'stock_route_warehouse', 'warehouse_id', 'route_id', 'Routes', domain="[('warehouse_selectable', '=', True)]", help='Defaults routes through the warehouse'),