Try 12 Microsoft Dynamics 365 Business Central Developer (MB-820) sample questions and practice-test preview prompts on AL, extensions, integrations, APIs, performance, testing, deployment, and Business Central development scope.
MB-820 is a Microsoft Dynamics 365 route for developers extending Microsoft Dynamics 365 Business Central.
IT Mastery coverage for MB-820 is under review. Use this page to try 12 original sample questions, review the route fit, likely assessed areas, and related live practice pages.
Practice option: Sample questions available
Start with the 12 sample questions on this page. Dedicated practice for MB-820: Microsoft Dynamics 365 Business Central Developer is not currently included as a full web-app practice page; enter your email to get updates when full practice becomes available or expands for this exam.
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| Area | Practical focus |
|---|---|
| Business process fit | Map sales, service, field service, finance, supply chain, or Business Central scenarios to the right route. |
| Configuration judgment | Review process setup, security roles, integrations, reporting, and operational constraints. |
| AI and extensibility | Connect Dynamics 365 apps with Copilot, Power Platform, and agentic workflows where relevant. |
| If you need practice now | Start here |
|---|---|
| Power Platform hub | Most Dynamics routes overlap with Power Platform configuration and extensibility. |
| AB-100 Agentic AI Architect | Business-app AI architecture route. |
| Microsoft 365 hub | Useful collaboration and admin context. |
Try these 12 original sample questions for Microsoft MB-820. They are designed for self-assessment and are not official exam questions.
Topic: AL extensions
A developer must add functionality to Business Central without modifying base application objects directly. What should be created?
Best answer: A
Explanation: Business Central development uses AL extensions to add or modify behavior in a supported way. This keeps customizations more upgradeable and deployable.
Topic: Event subscribers
A customization should run when a sales document is posted, but the developer wants to avoid changing standard posting code. What is the best pattern?
Best answer: B
Explanation: Event subscribers let extensions react to standard events. They reduce direct coupling to base code and improve upgradeability.
Topic: Tables and pages
A business needs a new setup table and a card page so users can maintain configuration values. Which objects are most relevant?
Best answer: C
Explanation: Business Central custom data and UI are commonly modeled with AL tables and pages. Validation and permissions should be part of the design.
Topic: APIs
An external system must read and update selected Business Central records through a controlled interface. What should the developer consider?
Best answer: D
Explanation: API pages expose Business Central data through supported services. Secure authentication and proper permissions are required for production integrations.
Topic: Permissions
A custom extension adds a table containing sensitive rebate rules. What should be included before release?
Best answer: A
Explanation: New objects need explicit security design. Permission sets ensure only authorized roles can read or modify sensitive extension data.
Topic: Reports
A customer wants a custom purchase document layout with grouped lines and calculated totals. What should the developer build or extend?
Best answer: B
Explanation: Business Central reports and layouts support custom business documents. The implementation should use supported report objects and layout tooling.
Topic: Testing
An extension changes pricing behavior. What should be included in the development approach?
Best answer: C
Explanation: Pricing changes affect revenue and customer documents. Tests should cover normal, exception, and regression scenarios before release.
Topic: Performance
A list page extension calculates values by querying related tables for every row and becomes slow. What should the developer review?
Best answer: D
Explanation: Page performance depends heavily on data access design. Developers should avoid expensive row-by-row calculations when better patterns are available.
Topic: AppSource readiness
An extension is intended for broad distribution. Which concern is most important?
Best answer: A
Explanation: Distributed Business Central apps require strong packaging and validation discipline. Dependencies, translations, permissions, and upgrade behavior matter before publication.
Topic: Upgrade behavior
A table field is being removed from an extension that is already installed for customers. What should the developer consider first?
Best answer: B
Explanation: Extension changes can affect customer data and dependent code. Obsolescence and data-upgrade planning reduce the risk of breaking installed tenants.
Topic: Integration troubleshooting
An API consumer receives authorization failures after a permission change. What should be checked?
Best answer: C
Explanation: API access depends on identity, authentication, and object permissions. A permission change can break integrations even if the endpoint still exists.
Topic: Route fit
Which activity best matches MB-820 preparation?
Best answer: D
Explanation: MB-820 is the Business Central Developer route. It focuses on AL development, extension design, testing, integration, security, and deployment.
Use this map to connect the sample questions to the Dynamics 365 business-process decisions this route usually tests.
flowchart LR
S1["Business Central extension need"] --> S2
S2["Design AL object model"] --> S3
S3["Develop pages tables and codeunits"] --> S4
S4["Integrate and test extension"] --> S5
S5["Package and deploy app"] --> S6
S6["Monitor and maintain solution"]
| Cue | What to remember |
|---|---|
| AL development | Understand tables, pages, codeunits, reports, events, and extensions. |
| Extension design | Use event subscribers and supported extension points instead of fragile modifications. |
| Integration | Plan APIs, web services, data exchange, and authentication. |
| Testing | Validate permissions, posting effects, upgrade behavior, and user experience. |
| Deployment | Package, publish, version, and maintain extensions across environments. |
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