The MB-820 exam validates your skills as a Microsoft Dynamics 365 Business Central Developer. This credential demonstrates proficiency in developing solutions, deploying applications, and integrating Business Central with enterprise systems. Whether you're advancing your career or completing the Dynamics 365 Business Central Developer Associate certification path, this guide helps you focus your study on what the exam actually tests. Use this resource to understand the syllabus, practice effectively, and build confidence before exam day.
Use this topic map to guide your study for Microsoft MB-820 (Microsoft Dynamics 365 Business Central Developer) within the Microsoft Dynamics 365 Business Central Developer Associate path.
The MB-820 exam uses multiple question types to assess both conceptual knowledge and practical problem-solving ability. Questions progress in difficulty and reflect real-world development scenarios you'll encounter on the job.
Questions are designed to reward practical understanding, not memorization. You'll encounter cumulative scenarios that connect development, deployment, and integration concepts across the full development workflow.
Effective preparation requires mapping the six core topics to a structured study plan and practicing with realistic questions. Allocate study time based on topic weight and your current skill level, then validate your understanding through scenario-based practice and timed assessments.
Explore other Microsoft certifications: view all Microsoft exams.
Strengthen your preparation with up-to-date resources from validexamdumps.com. These materials align to MB-820 and cover practical scenarios with clear explanations.
Visit the exam page to download the PDF, Online Practice Test, or get a bundle discount for both formats: Microsoft Dynamics 365 Business Central Developer.
Developing by using AL and AL objects typically accounts for the largest portion of the exam, reflecting the reality that most of your time as a Business Central developer is spent writing and maintaining code. Integration and deployment topics are also heavily tested because they represent critical real-world responsibilities. The remaining topics support these core areas and are tested in proportion to their importance in a typical development project.
A typical project starts with understanding Business Central architecture and capabilities (Describe Business Central), then moves to setting up your development environment (Work with development tools). You write AL code and build objects (Develop by using AL and AL objects) to meet business requirements. Once development is complete, you package and deploy the solution to a Business Central environment (Install, develop, and deploy). Finally, you integrate the solution with external systems like ERP, CRM, or accounting software (Integrate Business Central). Understanding these connections helps you answer scenario questions correctly because you see the full lifecycle, not isolated topics.
Hands-on experience is valuable but not required to pass the exam if you study effectively. Prioritize labs that let you write AL code in Visual Studio Code, create tables and pages, set breakpoints and debug, and deploy an app to a sandbox environment. If you have limited time, focus on labs covering AL syntax, object creation, and basic deployment because these topics are tested most heavily. Even 10-15 hours of guided lab work significantly boosts your confidence and understanding compared to study alone.
A frequent error is confusing when to use different AL object types (table vs. table extension, page vs. page extension). Another common mistake is misunderstanding deployment scenarios, such as when an app requires a major vs. minor version update. Candidates also lose points by not reading scenario questions carefully, missing details about environment constraints or integration requirements. Finally, some candidates underestimate the importance of integration topics and skip that section during study, then encounter integration questions they're unprepared for on exam day.
In your final week, stop learning new content and focus entirely on practice and review. Take one full-length practice test early in the week under timed conditions, then spend the next 3-4 days reviewing weak areas and re-reading explanations. Do a second shorter practice test mid-week to check your progress. In the final 2-3 days, skim your study notes and do quick topic reviews rather than deep dives. On the day before the exam, do a light review of high-weight topics (AL development and objects) and get good rest. This approach consolidates your knowledge and reduces test anxiety by building momentum heading into exam day.
Note: This question is part of a series of questions that present the same scenario. Each question in the series contains a unique solution that might meet the stated goals. Some question sets might have more than one correct solution, while others might not have a correct solution.
After you answer a question in this section, you will NOT be able to return to it. As a result these questions will not appear in the review screen.
A company plans to optimize its permission sets.
The company has the following permission sets:
You need to provide the following implementation for a third permission set:
* Create a new Permission Set C that is a composite of Permission Set A and Permission Set B.
* Assign Permission Set C to a user.
You need to ensure that the user has only read access to the Job table.
Solution: Set the Excluded Permission Sets property to Permission Set B.
Does the solution meet the goal?
You need to determine why the debugger does not start correctly.
What is the cause of the problem?
In Microsoft Dynamics 365 Business Central, when configuring snapshot debugging, it is crucial that the parameters in the configuration file are correctly set. From the options provided, the issue with the debugger not starting correctly is most likely due to an incorrect 'userId' parameter.
Option A is the cause of the problem. The 'userId' parameter must be the GUID of the user, not the username. The snapshot debugger needs the exact GUID to attach to the right session for debugging.
Option B is incorrect because 'breakOnNext' set to 'WebClient' is a valid setting. This tells the debugger to break on the next client action in the web client, which is a typical scenario.
Option C is not the cause of the problem. The 'userId' parameter is meant to specify which user session to debug, and this works in conjunction with the 'breakOnNext' parameter.
Option D is incorrect as the 'executionContext' parameter does not need to be set to 'Debug' for snapshot debugging to work. 'DebugAndProfile' is a valid value for the 'executionContext' parameter, as it allows for debugging and collecting performance information.
Therefore, the reason why the debugger does not start correctly is due to Option A: The 'userId' parameter must have the GUID of the user specified, not the username.
You create a page with the PageType property set to RoleCenter.
You navigate through the different sections of the page.
You need to add functionalities to the page.
What should you do?
When creating a page with the PageType property set to RoleCenter in Microsoft Dynamics 365 Business Central, it's essential to organize the functionalities and actions in a manner that enhances user experience and efficiency. The best practice is to define actions in the area (reporting) before actions in the area (creation) (A). This organization allows users to access reporting and analytical features quickly, which are commonly used in Role Centers for overview and insight purposes, before moving on to creation or transactional tasks. This logical flow aligns with typical user workflows, where analysis and review precede the creation of new records or transactions. The other options, such as defining the navigation menu in the area(processing) (B), defining the navigation bar in the area (embedding) (C), or adding a source table on the Role Center page (D), do not directly address the need to add functionalities to the Role Center page in a user-friendly manner.
A company uses Business Central Users in DepartmentA are assigned a base application permission set.
The company observes that Departments can display a critical page that should be unavailable to the department.
You need to resolve the system control issue.
What should you do?
You need to determine why the extension does not appear in the tenant.
What are two possible reasons for the disappearance? Each correct answer presents a complete solution.
NOTE: Each correct selection is worth one point.
In the context of Microsoft Dynamics 365 Business Central, an extension may not appear in the tenant for several reasons, particularly after an upgrade to a new major version.
Option A suggests that the extension was published as a DEV extension, which typically would not cause it to disappear after an upgrade because DEV extensions are intended for development and testing within sandbox environments.
Option B indicates that the extension was not compatible with the new version within 60 days of the first notification. This is a likely reason because Microsoft enforces compatibility rules, and extensions that are not made compatible within the specified timeframe might be removed or disabled.
Option C refers to the extension being published as a PTE (Per-Tenant Extension) and mentions the Platform parameter not being updated. This could cause issues, but not specifically the disappearance of the extension after an upgrade.
Option D expands on Option C by adding that both the Platform and Runtime parameters were not updated in the application file. This is a critical aspect because if these parameters are not correctly set to indicate compatibility with the new version of Business Central, the extension could be disabled or removed.
Option E is similar to Option B but mentions a 90-day period. This option does not align with standard Business Central practices for version compatibility requirements.
Therefore, the two possible reasons for the disappearance of the extension in the tenant after an upgrade are that the extension was not compatible with the new version within the required timeframe (Option B) and that the extension was published as a PTE without the Platform and Runtime parameters being updated (Option D).
