Relationships between related/associated tables must be explicitly established in the information schema of your database.
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Code is only generated for database tables with a Primary Key.
Some Windows Forms such as the "List filtered by a Combo Box" are only generated for tables that have explicit Foreign Key(s).
Some Stored Procedures (or Ad-hoc SQL) such as the "Select All By a Foreign Key", "Select, Skip, and Take By a Foreign Key", "Get Record Count by Foreign Key", and "Select Drop Down List Data" are only generated for tables that have explicit Foreign Key(s).