If you switch the dataview source to Registration entity from TrainingEvent entity, this error should be resolved.
Hi Ramy Hassan ,
Create a TrainingEvent entity object in the navigation or (where you call the page )
Thank you !!
Section 6.8.2 - First tab is for Overview which is to show all the existing registrations and this is built as list view with association Registration_TrainingEvent.
Section 6.8.3 - Second tab is for Details page which is built as data view with Registration entity as the page parameter.
he show this