I found my dataset on Kaggle.com, and as the dataset provided the IDs, I tried to use it.

After reading your comment, I tried to import one class using csvgen, and the Cube created was Compiled and Built successfully with all facts.

This is something unexpected but makes sense. 

I'll try and workaround to use those IDs and relationships between those tables.

Thanks @Eduard Lebedyuk 

Hi @Yuri Marx 
I have got a few topics that maybe could help you/help us laugh with the certification exam

InterSystems IRIS Core Solutions Developer Specialist 

Recommended preparation: Complete available IRIS development learning content 

https://learning.intersystems.com/enrol/index.php?id=196 

https://learning.intersystems.com/enrol/index.php?id=1038

https://cedocs.intersystems.com/latest/csp/docbook/DocBook.UI.Page.cls?K...

https://learning.intersystems.com/enrol/index.php?id=959

Classroom: Developing with InterSystems Objects and SQL 

#Overview
    Benefits
    Features
    Platforms and Versions

#Development Introduction
    Introduction to classes and methods
    Packages
    Persistent and serial classes
    Errors

#Architecture
    Namespaces and databases
    Globals and routines
    System databases
    Naming conventions

#Classes
    OOP/SQL correspondence
    Classes revisited
    Multiple inheritance
    Class compilation
    $System

#Properties
    Properties
    Datatypes
    Accessor and mutator methods
    Reference properties
    Implicit joins
    Foreign keys
    Cloning objects
    Computed properties

#Unit Testing
    Unit testing
    Benefits
    Framework

#Collections
    Collections
    List collections
    Array collections
    Object collections
    Data population

#Relationships
    Relationships
    Many-to-many relationships
    Performance options

#Streams and Files
    Streams
    Files

#Queries
    Sets of results
    Embedded SQL
    Dynamic SQL
    SQL stored procedures
    Command line shell
    Views
    Other SQL features

#Indexes and Tuning
    Indexes
    Indexing options
    Collation
    Index types
    Query performance tuning
    Index methods

#Methods
    Inherited methods
    Scripting languages
    Method attributes
    OOP callback methods
    SQL triggers
    ProcedureBlock methods
    Code mode
    Special method syntax
    
#Debugging
    Debugging with Studio
    Debugging with ZBreak