code: private boolean isMultiple(final Object _object)
          throws EFapsException
      {
          final boolean ret;
          if (_object instanceof Long && this.fromSelect != null) {
              final Object object = this.getObject(_object);
              if (object instanceof List<?>) {
                  ret = true;
              } else {
                  ret = false;
              }
          } else {
              ret = this.isMultiple();
          }
          return ret;
      }
docs: Method to determine if this OneSelect does return more than one value.
  @param _object Object used as filter (must be an <code>Long</code> Id)
  @return true if more than one value is returned, else false
  @throws EFapsException on error