code: public String getBaseOU() {
  
          if (m_isRootAccountManager) {
              return "";
          }
  
          if (m_managableOU.contains("")) {
              return "";
          }
          String base = m_managableOU.get(0);
          for (String ou : m_managableOU) {
              while (!ou.startsWith(base)) {
                  base = base.substring(0, base.length() - 1);
                  if (base.lastIndexOf("/") > -1) {
                      base = base.substring(0, base.lastIndexOf("/"));
                  } else {
                      return "";
                  }
              }
          }
          return base;
      }
docs: Get base ou for given manageable ous.<p>
  
  @return Base ou (may be outside of given ou)