code: private void fillResponseContext(UnitResponse.Context context) {
          context.setDestinationNodeId(unitRequest.getContext().getSourceNodeId());
          context.setSourceNodeId(LocalNodeManager.LOCAL_NODE_ID);
          context.setMsgId(unitRequest.getContext().getMsgId());
          context.setSsid(unitRequest.getContext().getSsid());
      }
docs: note that context data is full-filled step by step, not at once.