What is the required metadata attribute to trigger a preupdate rule?

To trigger a pre-update rule in Guidewire, the required metadata attribute is "Validatable." This attribute ensures that the specific entity or data model can be validated before any updates are applied. When an entity is marked as validatable, it signals the system to assess the data integrity and apply any business logic encapsulated in the pre-update rules prior to allowing the data update to take place.

This validation process is crucial in maintaining the integrity of the application's data state, ensuring that only valid and accurate information is persisted in the system. Therefore, properly configuring entities with this attribute is fundamental when setting up data validation workflows in Guidewire applications. Recognizing this allows developers to implement necessary checks based on the business requirements, ensuring compliance, consistency, and correctness of the data before updates occur.