Hello João, 

That's what I thought, I imagined that as I progressed in reading, following the chronological order, I could continue to follow and put the examples into practice.

But when I got to this article about Index I realized that the application was more advanced.

https://success.outsystems.com/Documentation/10/Developing_an_Application/Use_Data/Data_Modeling/Create_an_Entity_Index

Best Regards, 

Jessica Marques.