PL-900 Demonstrate the capabilities of Power Apps Practice Question
You are designing a Power Apps model-driven app for a sales team. The app must enforce that a discount field cannot exceed 50% of the total price. Where should you implement this validation?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a business rule on the table.
Business rules in model-driven apps provide real-time validation on forms. Option B is correct. Option A is wrong because the formula bar is for canvas apps. Option C is wrong because Power Automate is for backend automation, not instant form validation. Option D is wrong because JavaScript can be used but is not the recommended low-code approach.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
In the canvas app formula bar.
Why it's wrong here
Model-driven apps do not have a formula bar; canvas apps do.
- ✓
Create a business rule on the table.
Why this is correct
Business rules provide declarative validation on forms without code.
- ✗
Use a Power Automate flow triggered on record creation.
Why it's wrong here
Flows are asynchronous and do not prevent invalid data entry in real time.
- ✗
Write JavaScript in the form customisation.
Why it's wrong here
JavaScript in form customisation executes client-side in the browser, so it can be bypassed if a user submits data through a different channel, such as a data import or API call. The requirement demands server-side enforcement to guarantee the discount cap is always applied. This option is tempting because JavaScript is commonly used for real-time field validation and user feedback in model-driven apps, and it would be correct for a purely client-side UX constraint that does not require data integrity across all entry points.
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