Find On-hand Quantity of item X++

static void job(Args _args)
{ 
    InventOnhand _inventOnHand;
    InventTable _inventTable;
    InventQtyAvailPhysical onhandQTY;
    while select _inventTable 
    {
        _inventOnHand = InventOnhand::newItemId(_inventTable.ItemId);
        _inventOnHand.parmInventLocationId("ANNARBO");
      onhandQTY=  _inventOnHand.availPhysical();
          
        
        info(strFmt("On hand QTY for item %1 - is %2",_inventTable.ItemId,onhandQTY));
        
    } 
  
}