Hi ankita,
By using wizard read that node, and use invalidate method.
* navigate from <CONTEXT> to <N_DEFECT> via lead selection
lo_nd_n_defect = wd_context->get_child_node( name = wd_this->wdctx_n_defect ).
lo_nd_n_defect->invalidate( ).
Cheers,
Kris.