code: @SuppressWarnings("all")
      public static UnitResponse createRollingBack(String errMsg) {
          return UnitResponse.createUnknownError(null, errMsg).setContext(Context.create().setRollback(true));
      }
docs: Create a rolling back response object with the given message.
  
  @param errMsg the error message.
  @return An response object which will indicate a transactional rolling back.