What must developers do to ensure that new Doctors with an expired medical license cannot be saved?

Creating a new Validation Gosu Rule for the Doctor entity is the most effective approach to ensure that new Doctors with an expired medical license cannot be saved. This type of rule allows developers to impose business logic directly within the application, validating conditions at the point of data entry or modification.

The benefit of utilizing a Validation Gosu Rule lies in its ability to integrate seamlessly with the Guidewire platform’s workflow and data model. When a new Doctor is being added, this rule will execute and check the status of the medical license. If the license is found to be expired, the rule can prevent the Doctor's data from being saved and provide appropriate feedback to the user, thereby maintaining data integrity directly in the application layer.

Other approaches, while they may offer certain advantages, do not directly address the need for business logic enforcement in the same effective manner. For instance, implementing a database constraint might ensure that invalid data is not stored, but it does not provide the immediate feedback to users that a validation rule would. Disabling the save functionality in the UI does not allow for any flexibility or correction in real time, and merely creating a property enhancement does not enforce any validation logic in itself. Thus, using a Validation Gosu Rule stands out as the most suitable solution