Inventory OnHand Get through X++

real a;
    InventDimParm inventDimParm;
    inventDimParm.initFromInventDim(InventDim::find("00000492_069"));
    a =InventSumDatePhysicalDim::onHandQty(today(),"1001",InventDim::find("00000492_069"),inventDimParm);
    info(strfmt("%1",a));