SAE 8.1 has different logins for each exercise. I suspect you might be using the login associated with the Configuring a case type exercise, which is why you are seeing the GoGoCM-GoGoRoadCM-Work-AssistanceRequest Can you confirm which login you are using? The login for the Designing a data model exercise should be author_dm@gogoroad
I was able to figure out the error in next exercise system. The error is because when you create a SelectedServices data type (the page definition should point to the same data class for the source and target to be compatible).