Which statement isn't true about business rules for an entity?

The statement that business rules defined for an entity don't apply when using the entity with a canvas app is not true. In fact, business rules in Power Apps are designed to enforce business logic and validation across various app types, including canvas apps. When you create business rules for an entity in Dataverse, they can be triggered and executed based on actions taken within a canvas app that interacts with that entity.

This functionality ensures consistent data validation and behavior regardless of the app interface. It is essential for maintaining data integrity and adhering to business logic across different applications that utilize the same entity. Other options correctly identify scenarios where business rules do apply, like in model-driven apps and Excel, but the key aspect for the correct answer is to recognize that business rules are not exclusive to only certain kinds of applications.