making field in table read only based on row content

Hi All.

I have requirement to make one field in table as read only based on value of another field in the table.

I am populating the table and during population, I am using below code, but this is not working.

lo_node = wd_context->get_child_node( name = wd_this->wdctx_price ).

lt_elements = lo_node->get_elements( ).

LOOP AT lt_elements INTO ls_elements .

ls_elements->get_static_attributes(

      IMPORTING

        static_attributes = ls_data ).

      IF ls_data-konwa = '%'. “ Condition on which I have make another field PER_MEINS read only

        ls_elements->set_attribute_property(

          EXPORTING

            attribute_name = 'PER_MEINS'

            property       = 3 "if_wd_context_element=>e_property-read_only

            value          = abap_true ).

      ENDIF.

  ENDLOOP.

Can anyone please suggest how to achieve this.

Thanks in advance.