Hello,
I have been hitting a wall on this for a few hours.
I created a model-driven app, used a data integration to bring a table from local SQL and store it into an entity called CityMD MDM Facility.
When I view the system view "show as -> editable grid" it won't let me edit the field and says it is read-only.
I have tried using the solution explorer, creating a security role that can read/write to that entity (attached).
I assigned that role to myself with no effect. I also changed my profile to the administrator, and it had no effect.
Any help would be appreciated.