docs: public Dispatchable addEnlistedDispatchableForGlobalTransaction(int clientXAResourceId, XidProxy xid) {
          if (tc.isEntryEnabled())
              SibTr.entry(this, tc, "addEnlistedDispatchableForGlobalTransaction", new Object[] { "" + clientXAResourceId });
          AbstractFirstLevelMapEntry firstLevelEntry = null;
  
          // Locate the first level map entry - if there is one.
          if (idToFirstLevelEntryMap.containsKey(clientXAResourceId)) {
              firstLevelEntry =
                              (AbstractFirstLevelMapEntry) idToFirstLevelEntryMap.get(clientXAResourceId);
          }
  
          GlobalFirstLevelMapEntry entry = null;
          if (firstLevelEntry == null) {
              // If there is no first level map entry for this SIXAResource - create one
              entry = new GlobalFirstLevelMapEntry();
              idToFirstLevelEntryMap.put(clientXAResourceId, entry);
          } else {
              // This SIXAResource has already particiapted in work - as there is already
              // an instance - check that it isn't for a local transaction (which would
              // indicate a programming error).
              if (firstLevelEntry.isLocalTransaction()) {
                  final SIErrorException exception = new SIErrorException(CommsConstants.TRANTODISPATCHMAP_ADDENLISTEDGLOBALTX_01);
                  FFDCFilter.processException(exception, CLASS_NAME + ".addEnlistedDispatchableForGlobalTransaction",
                                              CommsConstants.TRANTODISPATCHMAP_ADDENLISTEDGLOBALTX_01,
                                              new Object[] { "" + clientXAResourceId, idToFirstLevelEntryMap, this });
                  if (tc.isEventEnabled())
                      SibTr.exception(this, tc, exception);
                  throw exception;
              }
  
              entry = (GlobalFirstLevelMapEntry) firstLevelEntry;
          }
          final Dispatchable result = entry.createNewEnlistedDispatchable(xid);
          if (tc.isEntryEnabled())
              SibTr.exit(this, tc, "addEnlistedDispatchableForGlobalTransaction", result);
          return result;
      }