title: Buttons Back, Leave and Cancel are inoperative in Hierarchical ALV
body: <p>I display a hierarchical ALV. When I click the BACK or LEAVE or CANCEL buttons (in the toolbar), I'm supposed to go back or leave the program or cancel .</p>
  <p>But when I click one of those buttons an additional row appends in the ALV hierarchy.</p>
  <p>Any help ?</p>