**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.


to_assign_route_ids = route_obj.search(cr, uid, [('supplied_wh_id', '=', warehouse.id), ('supplier_wh_id', '=', vals.get('default_resupply_wh_id'))], context=context)
                for inter_wh_route_id in to_assign_route_ids:
                    self.write(cr, uid, [warehouse.id], {'route_ids': [(4, inter_wh_route_id)]})
        return super(stock_warehouse, self).write(cr, uid, ids, vals=vals, context=context)
    def get_all_routes_for_wh(self, cr, uid, warehouse, context=None):
        route_obj = self.pool.get("stock.location.route")
        all_routes = [route.id for route in warehouse.route_ids]
        all_routes += route_obj.search(cr, uid, [('supplied_wh_id', '=', warehouse.id)], context=context)
        all_routes += [warehouse.mto_pull_id.route_id.id]
        return all_routes
    def view_all_routes_for_wh(self, cr, uid, ids, context=None):
        all_routes = []
        for wh in self.browse(cr, uid, ids, context=context):
            all_routes += self.get_all_routes_for_wh(cr, uid, wh, context=context)
        domain = [('id', 'in', all_routes)]
        return {
            'name': _('Warehouse\'s Routes'),
            'domain': domain,
            'res_model': 'stock.location.route',
            'type': 'ir.actions.act_window',
            'view_id': False,
            'view_mode': 'tree,form',
            'view_type': 'form',
            'limit': 20
        }
class stock_location_path(osv.osv):
    _name = "stock.location.path"
    _description = "Pushed Flows"
    _order = "name"
    def _get_rules(self, cr, uid, ids, context=None):