code: public MessageStore getOwningMessageStore()
      {
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
          {
              SibTr.entry(this, tc, "getOwningMessageStore");
              SibTr.exit(this, tc, "getOwningMessageStore", "return="+_ms);
          }
          return _ms;
      }
docs: This method is used to check the MessageStore instance that an implementing
  transaction object originated from. This is used to check that a transaction
  is being used to add Items to the same MessageStore as that it came from.
  
  @return The MessageStore instance where this transaction originated from.