Delphi Mainmenu items is not clicked

Some of my test fail because the mainmenu item is not clicked in keyword test en script 
sometimes this  works 
    var MainMenu = Aliases.Match.fMain.MainMenu;
    MainMenu.Click("Verkoop|Klok verdelen");
or 
   var MainMenu = Aliases.Match.fMain.MainMenu;
    MainMenu.Click("[0]|[14]|[0]");

What is the best way to open an main menu item in a script