What must be true about added fields in an entity extension?

In the context of entity extensions in Guidewire, it is essential that added fields adhere to a specific naming convention to ensure consistency and proper functionality within the application framework. The requirement for fields to end with a suffix of "_Ext" signifies that these fields are part of an extension of an existing entity rather than part of the core structure.

This suffix helps developers quickly identify which fields are part of an extension, thereby reducing confusion when maintaining or updating the code. It also aligns with best practices in code organization, making it easier to manage and evolve the application. Using this suffix is crucial for the proper integration of the extended fields with existing functionality, ensuring that they interact correctly with Guidewire's systems.

While options regarding field naming flexibility and suffixes may suggest that variations are allowed, the specific condition requiring the "_Ext" suffix serves a clear purpose in the context of entity extensions in Guidewire, reinforcing the importance of structure and clarity in development.