Exam Name: Microsoft Dynamics 365 Business Central Developer
Certification Provider: Microsoft
Corresponding Certification: Microsoft Dynamics 365
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Updated: Nov 08, 2026
No. of Questions: 130 Questions & Answers with Testing Engine
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Candidates often ask how we keep Microsoft Dynamics 365 Business Central Developer current in 2026. The answer is routine: our team reviews the exam for updates every day, and ActualVCE refreshes the 130 practice questions whenever the objectives shift.
Microsoft MB-820 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Develop by using AL | 15–20% | - AL syntax and programming concepts - Data manipulation and validation - Error handling and logging - Security and permissions - Performance optimization |
| Work with development tools | 10–15% | - Source control integration - Telemetry and diagnostics - AL Language extension - Visual Studio Code for AL development |
| Install, develop, and deploy for Business Central | 10–15% | - Build and deploy extensions
|
| Integrate Business Central with other applications | 10–15% | - Use APIs and web services - Authentication and security for integration - Power Platform integration - External data connections |
| Describe Business Central | 10–15% | - Describe Business Central apps
- Describe components and capabilities - Describe update lifecycle for customizations - Differentiate online and on-premises features - Describe Business Central architecture |
| Develop by using AL objects | 35–40% | - Create pages and reports
|
Common Questions About Microsoft Dynamics 365 Business Central Developer
Recommended: 1–2 years experience developing Business Central solutions, familiarity with AL language, Visual Studio Code, and development lifecycle
Microsoft Learn Exam Registration: register for MB-820
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The Microsoft Dynamics 365 Business Central Developer bank is maintained by a team of IT specialists who research the MB-820 questions in depth and organize the verified answers into an effective study sequence. Their ongoing work is what keeps the material professional rather than generic.
- Integrate Business Central with other applications (10–15%)
- Work with development tools (10–15%)
- Develop by using AL objects (35–40%)
Let the topic weights guide how you divide your study hours.
The online engine simulates the formal MB-820 test, lets you set your own time limit, and points out your mistakes after each session. Because it runs in a browser, you can practice anywhere and anytime, whether you are waiting for someone or sitting on a bus, and make real use of spare minutes.
The package includes 130 practice questions for the MB-820 exam, all verified by our IT specialists. A free demo is available so you can review the style before purchasing.
Microsoft Learn: Dynamics 365 Business Central Developer Learning Paths: Visit official page
The passing score for MB-820 is 700 (on a scale of 1–1000), and the official exam fee is $165 USD. Keeping these figures in view helps you set a realistic target for your practice sessions.
You will face 40–60 questions in 90 minutes minutes on the real MB-820 exam. Rehearsing under the same limits on the ActualVCE engine turns time management into a trained reflex.
Microsoft Dynamics 365 Business Central Developer Sample Questions:
You are creating a new Business Central report.
You plan to use triggers and functions to dynamically create a dataset and control the report behavior.
You must provide the following implementation.
* Run when the report is loaded.
* Run when the data item is iterated for the last time.
* Skip the rest of the report.
You need to select the triggers and functions for the report.
Which triggers and functions should you use? To answer, select the appropriate options in the answer area.
NOTE: Each correct selection is worth one point.
Correct Answer:
Explanation:
* Runs when the report is loaded: OnInitReport
* Runs when the data item has been iterated for the last time: OnPostDataItem
* Use this function to skip the rest of the report: CurrReport.Quit()
1. Requirement: Runs when the report is loaded.
* Selection: OnInitReport
* Reasoning: The OnInitReport trigger is the very first event that fires when the report object is instantiated (loaded). It runs before the request page is displayed, making it the correct choice for " when the report is loaded. "
* Contrast: OnPreReport runs after the request page, just before the data processing starts.
2. Requirement: Runs when the data item has been iterated for the last time.
* Selection: OnPostDataItem
* Reasoning: The OnPostDataItem trigger executes immediately after the report has finished iterating through all records belonging to that specific data item.
* Contrast: OnPreDataItem runs before the loop starts, and OnAfterGetRecord runs repeatedly during the loop (for every record).
3. Requirement: Use this function to skip the rest of the report.
* Selection: CurrReport.Quit()
* Reasoning: The CurrReport.Quit() function completely aborts the execution of the report, effectively " skipping " everything else remaining in the report logic.
* Contrast: CurrReport.Skip() only skips the current record processing and moves to the next record. CurrReport.Break() exits the current data item loop but proceeds to the next data item (if any) or finishes the report normally.
You need to create the configuration table and page for the non-conformity functionality.
Which table configurations should you use? To answer, select the appropriate options in the answer area.
NOTE: Each correct selection is worth one point
Correct Answer:
Explanation:
Design pattern for the setup table:
* The correct selection here is Adapter . The Adapter design pattern is commonly used when you need to handle integration points or create a setup table that acts as an intermediary for data manipulation, which fits the requirement for the configuration of the non-conformity functionality.
Data type of the primary key field:
* The correct data type is Code . In Business Central, when creating a table with a primary key field, the Code data type is typically used for fields such as document numbers, codes, and identifiers. For a setup table, a Code field is appropriate for keys like " No. " series or setup identifiers.
Property required to prevent users from adding records:
* The correct property is InitValue . This property is used to set initial values for fields and can be configured in such a way that users are prevented from adding records directly, typically enforcing control over record creation and editing in configuration scenarios.
You create an ' AddltemsToJson " procedure and publish it.
The procedure fails to run.
You need to fix the errors in the code.
For each of the following statements, select Yes if the statement is true. Otherwise, select No.
Correct Answer:
Explanation:
* In line 13, replace the Add method with Insert. = NO
* In line 15, replace the WriteTo method with ReadFrom. = NO
* Change the ItemObject variable type from JsonObject to JsonToken. = NO
* Move line 08 in the beginning of REPEAT .. UNTIL. = YES
The provided code is intended to serialize a list of items from the Item table into a JSON array format. Here is a breakdown of the code and the necessary corrections:
* In line 13, " ItemsArray.Add(ItemObject) " : This line is correctly using the Add method to add the ItemObject to the ItemsArray . The Add method is the correct method to use for adding items to a JsonArray . Therefore, there is no need to replace Add with Insert .
* In line 15, " ItemsArray.WriteTo(RequestText) " : The WriteTo method is used correctly to serialize the ItemsArray into a JSON formatted string and store it in the RequestText variable. The ReadFrom method is used for the opposite operation, i.e., to deserialize a JSON formatted string into a JsonArray
, which is not the goal in this context. Hence, no change is needed here.
* Change the ItemObject variable type from JsonObject to JsonToken : The ItemObject variable is intended to hold JSON objects representing individual items, making JsonObject the appropriate type.
JsonToken is not a type used in this context within AL for Business Central, and thus the variable type should remain as JsonObject .
* Move line 08, " Clear(ItemObject) " : This line should be moved inside the repeat loop to ensure that the ItemObject is cleared for each item in the loop. Placing it before the repeat would only clear it once before the loop starts, which could lead to incorrect serialization as the previous item ' s properties would not be cleared from the ItemObject .
The logic for serializing records into JSON is a common operation when interfacing with APIs or web services in Business Central, and the pattern shown in the code is typical for such operations.
You are developing an app that will be published to Microsoft AppSource.
The app requires code analyzers to enforce some rules. You plan to add the analyzers to the settings.json file.
You need to activate the analyzers for the project.
Which three code analyzers should you activate to develop the app for AppSource? Each correct answer presents part of the solution NOTE: Each correct selection is worth one point.
- A. a custom rule set
- B. PerTenantExtensionCop
- C. AppSourceCop
- D. CodeCop
- E. UlCop
Correct Answer: C,D,E 🗳️
A company has a test application.
A user observes the following error messages when running the test:
* " Unhandled Ul: Message '
* " Unhandled Ul: Confirm "
You need to resolve the errors. Which action should you take?
- A. Create a separate test codeunit that has Message Handler and Confirm Handler methods.
- B. Create the Message Handler and Confirm Handler methods in the test codeunit.
- C. Create the Message Handler and Confirm Handler methods in the test runner codeunit.
- D. Create a separate test runner codeunit that has Message Handler and Confirm Handler methods.
Correct Answer: A 🗳️
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