It seems that the problem is the require once line of code that you have for the helper file. There are two things that I think you could do to resolve this, you can try adding this include to the page with the menu on it.
If that does not work you will need to adjust the path to this include on the menu.php page. You should try removing the ../../ in front of it so that it looks like this:
<?php require_once( "WA_SecurityAssist/Helper_PHP.php" ); ?>
I think that one of these or both should give you the correct result.