code: @Override
      public final Exception isCorrect (final ProtocolDataUnit protocolDataUnit) {
  
          // FIXME: Implement
          try {
              if (!connection.getSettingAsBoolean(OperationalTextKey.DATA_PDU_IN_ORDER) && !connection.getSettingAsBoolean(OperationalTextKey.DATA_SEQUENCE_IN_ORDER)) {
                  return new UnsupportedOperationException(new StringBuilder(OperationalTextKey.DATA_PDU_IN_ORDER.toString()).append(" is yet not supported.").toString());
              } else {
                  return null;
              }
          } catch (OperationalTextKeyException e) {
              return e;
          }
  
      }
docs: {@inheritDoc}