in the course is says - 

Select an option from the Party class list to identify the class used to describe the party. The party class must be either the Data-Party class or one of its descendants.

but in the exercise steps it says:

1. In the "List of valid parties" section of the rule form, click the Add a row icon.
2. In the new row, under Party Name, enter Employee.
3. Under Party Class, select or enter TGB-HR-Data-Employee.

The exercise steps do not appear to work or align with the course body