MSS Direct Reports Security Rule

Has anyone able to secure the Manager Self Service to only allow access to direct reports and employees reporting under the supervisors? I had used the Lawson examples but I am getting errors and it is not working. Here's the formula:

   
   if(user.isSupervisorOf(getIdFromEmpNbr(lztrim(table.COMPANY),lztrim(table.EMPLOYEE))))'ALL_ACCESS';
else'NO_ACCESS';