code: @Override
      public void configureSelected(PMContext ctx) throws NumberFormatException, PMException {
          if (ctx.getEntityContainer().isSelectedNew()) {
              ctx.getEntityContainer().setSelected(null);
          } else {
              super.configureSelected(ctx);
          }
      }
docs: List action must not try to configure selected item. Instead if list
  detect that the selected item is new (thay may happen when user start new
  operation but desist), selected item must be se to null.
  
  @param ctx PM Context