What must be done to update an existing business rule in PowerApps?

To update an existing business rule in PowerApps, it is essential first to deactivate the original rule before making any changes. This process ensures that any modifications are made without affecting the application's current functionality. Business rules manage various conditions and logic, and having an active rule while trying to edit it can lead to conflicts and unintended consequences in user experience or data integrity.

Once the original rule is deactivated, you can make the necessary changes. After completing the updates, the rule can then be reactivated so that the new conditions and logic take effect. This step-by-step approach helps in maintaining a stable application environment and allows users to validate modifications before they go live.