Power Platform gives teams several ways to implement the same business rule. That flexibility is valuable—but it also makes architectural drift easy.
A validation might begin in a Canvas App, get copied into a cloud flow, and later appear again in a plugin. Each version works until one changes and the others do not. The right question is not “Can low-code do this?” It is “Where must this rule live to stay true?”
Begin with the boundary.
If a rule must apply regardless of whether data arrives from a model-driven app, Canvas App, import, integration, or API, place it at or behind the Dataverse boundary. Client-side logic can improve the experience, but it should not be the only enforcement point for an invariant.
Use the lightest reliable tool.
- Business rules suit simple field behavior and straightforward validation.
- Power Automate suits asynchronous orchestration, notifications, approvals, and connectors.
- Plugins suit transactional validation, synchronous calculations, and logic that must run for every data path.
- Custom APIs suit explicit business operations needing a stable contract and reusable server-side implementation.
- External services suit compute-heavy work, specialized dependencies, or processing that should not consume Dataverse execution time.
Watch for three warning signs.
Move beyond a convenient low-code implementation when logic is duplicated across entry points, when failure must prevent a transaction, or when a flow has become a deeply nested substitute for a testable function.
Keep experience logic close to the experience. Keep business invariants close to the data.
Architecture is also an operating decision.
The technically ideal extension point is not sustainable if nobody on the team can support it. Choose an approach that matches the consequence of failure, expected scale, deployment discipline, and skills available after handoff.