Here you are trying to generate overview pages for Non persistable entity. But right now, mendix will allow us to perform this action only on persistable objects. That’s the reason, it’s got disabled for you on non persistable object.
SriLatha is right.
It makes perfect sense. Where should these non persistable objects come from when you have a default overview page. You would need to have a datasource microflow, but this is custom logic. It would need to create objects. How should the system know how many of them to create? Which data should be stored in the attributes? …?
Thanks SriLatha….I had accidentally turned on “Generalization” at entity level. That disabled the overview pages menu. Now it is working.