To understand the valid statements regarding the field group list:
An auto loan application can extend MyCo-Data-Loan-Auto without affecting a sum performed against .Loans.Amount:
Since MyCo-Data-Loan-Auto extends MyCo-Data-Loan, it can be included in the field group list. Calculations like sums on .Loans.Amount will not be affected as they are based on the common superclass.
All pages within the .Loans field group must be the same class, either MyCo-Data-Loan-Auto or MyCo-Data-Loan-Mortgage:
The field group list should maintain consistency in the class type for its pages. Mixing classes within the field group can lead to errors and unpredictable behavior.
A rule in MyCo-Data-Loan-Mortgage can only be referenced through .Loans if also defined in MyCo-Data-Loan:
To reference rules through the field group list, they must be accessible via the common superclass (MyCo-Data-Loan). This ensures that rules can be consistently applied across different subclasses.
Reference:
Pega Documentation on Field Groups: Field Groups
Pega Documentation on Class Inheritance: Class Inheritance