Until now it was all too easy to create and publish a solution and overlook the backing relationships needed for the lookups that are present in the tables.
A feature update is being released in October that will allow a publisher to modify table properties within their solutions even though Allow Customizations is set to off.
We are continuing to improve how we handle cascading operations in the Common Data Service for model driven apps and Dynamics 365 to allow you to be more productive.
Two exciting new enhancements are available as a preview for Powerapps, the addition of a File data type and enhancements to Image! Out of the box, CDS can now natively support:
Large, high resolution images
Files as a data type
Multiple image and file fields per entity
Use of blob storage for large file types to reduce consumption of relational storage