Delete physical reservation from x++

hi,

 I use AX 2009. I would like to delete physical reservation from SalesLine. I use below code but it doesn't remove transaction. After executed it transaction with physical reservation still exist. Why?

        salesLine = SalesLine::find("ZS/BOK/2013/007553", 0, true);
        movement = InventMovement::construct(salesLine);
        upd = InventUpd_Reservation::newMovement(movement, 0, true);
        upd.updateNow();