I suspected as much. How did you create this data object? I suspect you’ve created it yourself rather than using the Data Object create wizard or Blueprint import.
So there are some basics Constellation is expecting.
Data Pages
The most common reason it is not here is you haven’t created a Single and List Data page for that object? The list data page should be queryable.
Abstract Classes
Next common issue, the object you created is Abstract? See Abstract classes in Constellation
Modified Data Pages
You may have modified the OOTB datapages, and loaded it from something like an activity? See https://docs.pega.com/bundle/platform/page/platform/data-integration/data-pages-constellation.html
Default Data Sources
Less likely, maybe you haven’t set this?
