Collaborative Filtering Item Recommendation how can I create output "item_id" with title name

hi 

I use Rapidminner for Collaborative Filtering Item Recommendation with user k-nn  and the result at "item_id" is number like this


so how can I create or replace number in 'item_id'  with title name like this. Or how can I show output with title name in new attribute.


I try to use set role operator and set additional roles : attribute 'title' with 'item identification' but output is the same. the "item_id" still be number. 

sorry for my English isn't good.
Thanks you for your help