code: public void unassignRoleInDb(final JAASSystem _jaasSystem,
                                   final Role _role)
          throws EFapsException
      {
          unassignFromUserObjectInDb(CIAdminUser.Person2Role.getType(), _jaasSystem, _role);
      }
docs: The given role is unassigned for the given JAAS system from this person.
  
  @param _jaasSystem JAAS system for which the role is assigned
  @param _role role to unassign
  @see AbstractUserObject#unassignFromUserObjectInDb(Type, JAASSystem,
  AbstractUserObject)
  @throws EFapsException on error