Which step must a developer take to add a new column field to the OOTB Activity entity?

To successfully add a new column field to the out-of-the-box (OOTB) Activity entity in Guidewire, the first step is to create an Activity.etx file if one does not already exist. The .etx file is essential as it allows developers to define new fields and customize the entity's structure within the application.

The Activity.etx file holds the entity's metadata, including various attributes such as fields, field types, and validations. Without this file, there will be no framework in place to define the new column. By creating or updating this file, the developer ensures that the system can recognize and manage the new column appropriately, aligning with Guidewire's architecture principles.

The correct approach is fundamental because it sets the groundwork for all subsequent changes and adjustments necessary for incorporating the new field in the database, user interface, and other related configurations within the Guidewire environment.