Problems in the first steps with SAP Applications Studio

I'm trying to do a simple task: - I've created a new BO and I'm trying to add some simple logic like in https://www.youtube.com/watch?v=ApmmzBs2H_E&t=259s This is my BO definition:

but, when I go to the generated script file and type "this.", I can't see my bo fields (elements):

Do you know where is my mistake?

Thanks in advance!