Vol1, 2019 shows a fix for this issue
NullReferenceException will no longer thrown when multiple complex properties are used in data object.
But it is not fixed. The attached project demonstrates that this bug was fixed in some circumstances but not all. In FormPage OnAppearing Method if you use the FormDTO data object it works fine. If you use FormDTO2 data object it throws the exception.
Please advise ASAP as I have been waiting for several weeks for this fix inf Vol1, 2019.