/**
  * Set up ExistsReferrer (co-related sub-query). <br>
  * {exists (select SERVICE_RANK_CODE from MEMBER_SERVICE where ...)} <br>
  * MEMBER_SERVICE as 'memberServiceAsOne'.
  *
  * <pre>
  * cb.query().<span style="color: #FD4747">existsMemberServiceList</span>(new SubQuery&lt;MemberServiceCB&gt;() {
  *     public void query(ServiceRankCB subCB) {
  *         subCB.query().setXxx...
  *     }
  * });
  * </pre>
  *
  * @param subQuery The sub-query of MemberServiceList for 'exists'. (NotNull)
  */
 public void existsMemberServiceList(SubQuery<MemberServiceCB> subQuery) {
   assertObjectNotNull("subQuery<MemberServiceCB>", subQuery);
   MemberServiceCB cb = new MemberServiceCB();
   cb.xsetupForExistsReferrer(this);
   subQuery.query(cb);
   String subQueryPropertyName =
       keepServiceRankCode_ExistsReferrer_MemberServiceList(cb.query()); // for saving query-value.
   registerExistsReferrer(
       cb.query(), "SERVICE_RANK_CODE", "SERVICE_RANK_CODE", subQueryPropertyName);
 }