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A Microsoft Dynamics 365 Business Central Developer credential carries weight because Microsoft sets the standards employers trust. Fast2test helps you earn it with 173 expert-written MB-820 practice questions, reviewed and refreshed for 2026.
Microsoft MB-820 Exam Overview:
| Certification Vendor: | Microsoft |
|---|---|
| Exam Name: | Microsoft Dynamics 365 Business Central Developer |
| Exam Number: | MB-820 |
| Exam Format: | Multiple-response, Case studies, Multiple-choice, Scenario-based questions |
| Available Languages: | Chinese (Simplified), Spanish, Korean, Portuguese (Brazil), German, French, Japanese, English |
| Real Exam Qty: | 40-60 |
| Exam Price: | $165 USD (varies by region) |
| Certificate Validity Period: | 1 year (renewable via Microsoft certification renewal assessment) |
| Related Certifications: | Microsoft Certified: Dynamics 365 Business Central Functional Consultant Associate |
| Passing Score: | 700/1000 |
| Exam Duration: | 120 minutes |
| Recommended Training: | Dynamics 365 Business Central documentation Microsoft Learn - Business Central Developer Training |
| Exam Registration: | Microsoft Certification Exam Registration Pearson VUE Microsoft Exams |
| Sample Questions: | Microsoft MB-820 Sample Questions |
| Exam Way: | Online proctored or onsite test center via Pearson VUE |
| Pre Condition: | Basic understanding of Microsoft Dynamics 365 Business Central and AL development language is recommended |
| Official Syllabus URL: | https://learn.microsoft.com/en-us/credentials/certifications/d365-business-central-developer-associate/ |
Microsoft MB-820 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Integrate solutions | - Data integration
|
| Extend Dynamics 365 Business Central | - Customization techniques
|
| Deploy and maintain solutions | - Deployment processes
|
| Debug and optimize solutions | - Performance optimization
|
| Develop by using AL | - AL language fundamentals
|
Your Microsoft Dynamics 365 Business Central Developer Questions, Answered
The MB-820 exam, officially titled Microsoft Dynamics 365 Business Central Developer, is the qualifying test for the Microsoft Certified: Dynamics 365 Business Central Developer Associate certification from Microsoft, a credential at the Associate level. Passing it proves you have the skills employers look for in certified professionals, and it can also support progress toward related credentials such as Microsoft Certified: Dynamics 365 Business Central Functional Consultant Associate.
The Microsoft Dynamics 365 Business Central Developer exam gives you 120 minutes to work through 40-60 questions. That is a steady pace with little room for second-guessing, so train yourself to read each question once, flag the difficult ones, and keep moving. Before exam day, sit at least two full timed sessions in the Fast2test test engine — when the clock feels familiar, it stops being a threat.
You need 700/1000 to pass, and the official registration fee is $165 USD (varies by region). Fall short and you pay that fee in full again for every retake, which makes solid preparation the cheaper option by far. Work through the Fast2test practice questions until you score comfortably above the passing mark, then book your seat.
Basic understanding of Microsoft Dynamics 365 Business Central and AL development language is recommended Eligibility rules can change over time, so before you register, confirm the latest requirements on the official exam page: Microsoft MB-820 exam overview.
You can book your MB-820 exam through any of these official registration channels:
The exam is delivered as Online proctored or onsite test center via Pearson VUE, so you can pick the option that fits your schedule when you book.
Microsoft recommends the following training for Microsoft Dynamics 365 Business Central Developer candidates:
Pair that training with the 173 practice questions from Fast2test and you can check your readiness topic by topic before exam day.
Yes. Fast2test offers a free PDF demo for the Microsoft Dynamics 365 Business Central Developer exam so you can judge the quality of our questions and answers before paying anything. Every purchase also comes with 365 days of free updates, and once that period expires you can extend your update service at a 50% discount.
Your purchase is protected by a 100% money-back guarantee. If you sit the corresponding MB-820 exam within 60 days of buying and do not pass, send us a scan of your exam enrollment slip together with your official Score Report (PDF) within 2 days of the exam date — the candidate name must match the payer's name — and we will process your full refund within 7 days. Please note that exams taken within 3 days of purchase, materials downloaded without ever sitting the exam, free products, and expired orders are not covered. If you would rather not have a refund, you can exchange your order for two exam products of equal value, free of charge, and keep the update service on your original purchase.
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The Microsoft Dynamics 365 Business Central Developer syllabus is organized into 5 domains. The main areas include Develop by using AL, Debug and optimize solutions, and Deploy and maintain solutions. Scroll up to the Exam Topics section above for the complete, current outline before you plan your study schedule.
Microsoft Dynamics 365 Business Central Developer Sample Questions:
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 ExcludedPermissionSets property to Permission Set B.
Does the solution meet the goal?
- A. No
- B. Yes
Correct Answer: A 🗳️
You have an XMLport that exports items from a database to an XML file.
You need to change the export format from XML to CSV.
What should you do?
- A. Fill the FileName property with the Items.csv value.
- B. Change the Direction property to Both.
- C. Change the FormatEvaluate property to Legacy.
- D. Change the Format property to VariableText.
- E. Change the XmlVersionNo property to 1.1.
Correct Answer: D 🗳️
Explanation: Only visible for Fast2test members. You can sign-up / login (it's free).
Case Study 3 - Fabrikam Inc
Company background and technical environment
Current environment
Fabrikam Inc. is a medium-sized company that plans to implement Dynamics 365 Business Central as an ERP system. The company has a development department that will help with the ERP implementation.
Most employees work remotely from different countries or regions and speak different languages.
The various locations and languages cause issues with the current on-premises software.
Planned improvements
Fabrikam Inc. plans to implement new and modern software to manage the company. The company wants to use Business Central because it is cloud-based and meets all company requirements.
The company intends to improve reporting and integration functionality by using modern tools such as Power BI and APIs. To reduce the amount of information sent by email, the company plans to expose vendor information to be consumed from external users.
Technical specifications
The development department installed Visual Studio Code to create Business Central extensions so the ERP system could be customized according to company needs. All extensions must be developed for the Business Central 2024 wave 1 online version.
The development department plans to use telemetry to control the appropriate use of each new development and works directly in licensed sandbox environments supplied by Microsoft.
Department-specific requirements
The following departments at Fabrikam Inc. have multiple requirements:
- Development
- Control
- Accounting
- Quality
Development department
The development department designed an extension for the purchase department. Because the developers plan to work with telemetry for monitoring operations, they need the Application Insights information. To accomplish this, the department must add a setting in the corresponding file.
The quality department does not want to receive any warning about the Application Insights setting when the extension is compiled.
Control department
The control department requires customizations to Business Central by using a per-tenant extension (PTE) named Subcontract Docs. The PTE includes a table named Subcontract Documents. The table has the following fields:
ID: A unique identifier
Subcontract No.: Related to the standard Vendors table
Description: A short description of a received document
Document: A media type that has the document
Comments: Comments about the document
Date: When the document was imported
Amount: Amount related with the imported document
Posted: Indicates if the document is managed
The extension must be in English - United States (ENU) and Spanish Traditional Sort (ESP) so the application can be used in both languages. The translations must be on the table, not on the page, to avoid repeating them. The control department does not want to use translation files.
The control department manager requires a brief guide for the Description and Comments fields when employees create a new record so users know what to include in the fields. The guide must disappear as soon as users add a value in the fields.
The Subcontract Documents table must be displayed on a new page named Subcontract Document List through an action from the standard Vendor page.
The Amount field, included in the Subcontract Document List, must be formatted in bold format when the record is posted (field Posted = true).
The control department also requires a report to display a list of subcontract documents named Subcontract Documents Excel List. The report must meet the following requirements:
- Downloads a file only in Microsoft Excel.
- Includes a predefined format with two worksheets: one with the posted subcontract documents and another with the unposted subcontract documents.
Accounting department
The accounting department plans to use Power BI to analyze information generated by the control department. The accounting department plans to expose an API named API Customer Lines. To improve the performance, the API must use read-only information and work with a Query object to summarize the data.
You have the following code:
The accounting department must expose data such as the following:
The qty column must be the sum of the Outstanding quantity field of Sales Order Lines. It must be in descending order by quantity.
The department also exposes a page named Fabrikam Vendor API that includes vendor information from the Vendor table, such as number and name. The API must use the replica database to improve performance.
Because Fabrikam Inc. is based in multiple countries and regions, the company periodically must send accounting movements between two dates to the local tax offices named Fabrikam Accounting.
The format for this file must be an XML file generated by an XMLport object. For security reasons, it is not possible to receive data from this XMLport.
The generated XML file must have a schema like this:
Quality department
The quality department requires that every new app or extension is designed to meet standard company guidelines. The quality department plans to follow the standard Business Central data model. The quality development must be able to use triggers correctly.
The department must ensure that when a vendor is deleted, the system also removes each record in the Subcontract Documents table related to the vendor. If the subcontract document record has the field Posted = false, it must not be possible to delete the record.
The department has a version 1.0.0.1 installed for an extension named Quality Control. The department develops a new version 1.0.0.2 and uses a codeunit with the subtype Upgrade to update it. The department requires the values for AppVersion and DataVersion on the trigger OnUpgradePerCompany after using NavApp.GetCurrentModuleInfo(myinfo).
Hotspot Question
You need to create the Fabrikam Vendor API for the accounting department.
How should you complete the code segment? To answer, select the appropriate options in the answer area.
NOTE: Each correct selection is worth one point.
Correct Answer:

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 creates a Business Central app and a table named MyTable to store records when sales orders are posted.
Users report the following issues:
- The users receive permission errors related to MyTable.
- Users are no longer able to post sales orders since installing the
new app.
- The users cannot access the list page created in MyTable.
You need to resolve the user issues without creating new permission sets. You must use the principle of least privilege.
Solution: Assign a SUPER permission set.
Does the solution meet the goal?
- A. No
- B. Yes
Correct Answer: A 🗳️
Case Study 1 - Contoso, Ltd
Background
Contoso, Ltd. is a sales company in the manufacturing industry. It has subsidiaries in multiple countries/regions, each with its own localization. The subsidiaries must be data-independent from each other. Contoso. Ltd. uses an external business partner to manage the subcontracting of some manufacturing items. Contoso, Ltd. has different sectors with data security between sectors required.
Current environment
Contoso, Ltd. uses Business Central online as the main ERP for financials, sales, purchase, warehouse, and manufacturing processes. It has employees that use the Business Central web application and external applications. The company has a custom external mobile app under development.
The IT department and its partners installed custom extensions to satisfy the company's requirements where the functionality is not available natively.
Contoso, Ltd. interacts with external services provided by customers and partners. Different applications interact with SOAP and OData endpoints exposed from Business Central.
An external business partner of Contoso, Ltd. exposed a REST API for receiving details about new subcontracting orders and for sending the planned release date of each subcontracting order received.
Contoso, Ltd. has not activated the monitoring of the tenant and has no internal telemetry for its apps.
Custom reporting must be created to meet the requirements of the different departments.
Tenant management
Contoso, Ltd. has the following tenant management considerations:
IT department
The IT department requires the ability to monitor the tenant to prevent performance problems and detect possible anomalies.
The IT department plans to use Azure Application Insights and Log Analytics to inspect the ingested telemetry signals.
All tenant upgrades are automatically handled by Microsoft. The IT department does not check for update availability or for tenant-related notifications.
The IT department has not configured the receipt of tenant-related notifications from the Business Central admin center.
External business partner
The external business partner must add custom telemetry to an application created for Contoso, Ltd. to monitor a business process.
Custom telemetry signals for the application must be visible only on the partner's telemetry.
SOAP
Contoso, Ltd. plans to dismiss using the SOAP protocol for integrations.
Contoso, Ltd. must be able to detect if external applications are using its Business Central SOAP endpoints.
Issue
The Business Central tenant is upgraded by Microsoft to a new major version during the night.
Users report that one of the Contoso, Ltd. extensions disappeared from the tenant. The IT department confirms that the extension is still published.
Custom mobile application requirements
Contoso, Ltd. plans to create a custom mobile application that has the following requirements:
The app must be used by employees to check item details from the ERP in real time and to report issues that occur during the manufacturing process.
An AL extension must be created for handling archived issues.
Business Central development guidelines must be followed when implementing modules.
A module must be implemented for the reporting and tracking of issues information. You plan to call this module Issue Management. The module must expose a method named PostIssue.
Code modifications will be required over time.
The Issue Management process must be split into two extensions:
ISSUE BASE: main extension
ISSUE EXT: second extension with dependency from ISSUE BASE
In the version 1.0.0.0 of the ISSUE BASE extension, you plan to create an Issue table that contains a global Decimal variable named IssueTotal.
In the version 1.0.0.0 of the ISSUE BASE extension, you plan to define a table named Issue Category with a Description field defined as follows:
The Issue table defined in ISSUE BASE extension contains a Clone procedure defined as follows:
In the ISSUE EXT extension, you create a tableextension object of the Issue table.
The tableextension object of the Issue table must access the IssueTotal: Decimal variable.
After weeks of usage, you discover that you must remove the Description field and the Clone procedure because they are no longer required.
In a new version of the ISSUE BASE extension, you create a new Issue Type table. You must move data row by row from a previously obsolete Issue Category table to the new Issue Type table. Because a large amount of data must be moved, you must write an Upgrade codeunit by using the DataTransfer object.
The IT department creates a custom API for exposing the custom Issue table. The API provides an action for copying an issue to a new table. The action is defined as follows:
Contoso, Ltd. must create an API in Business Central to expose item details to the mobile application.
The API must have the lowest possible impact on the production environment when used during working hours.
The API must only support Get operations.
Debugging problems
A user of the ISSUE BASE extension in Business Central reports a problem.
To debug the problem, snapshot debugging with the following configuration was activated:
You discover that the debugging is not triggering.
Integration with business partner for subcontracting
Contoso, Ltd. must connect Business Central to the external API provided by the business partner. This will be used for the partner to send the details of new subcontracting orders to fulfill the sales demand, and for receiving the planned release date of each order sent. The integration requirements are as follows:
The business partner will provide a REST API secured with basic authentication. Credentials to access the API will be shared with Contoso, Ltd.
The API for sending subcontracting orders must be called by sending an authenticated POST request to the given endpoint.
The API for retrieving the order no. and planned release date of each subcontracting order responds with the following JSON:
Each order no. must be retrieved.
You need to call the Issue API action from the mobile application.
Which action should you use?
- A. POST /issues(88122e0e-5796-ec11-bb87-000d3a392eb5)/Microsoft.NAV.copy
- B. POST /issues(88122e0e-5796-ec11-bb87-000d3a392eb5)/Copy
- C. POST /issues(88122e0e-5796-ec11-bb87-000d3a392eb5)/Microsoft.NAV.Copy
- D. PATCH /issues(88122e0e-5796-ec11-bb87-000d3a392eb5)/Microsoft.NAV.Copy
- E. POST /issues(88122e0e-5796-ec11-bb87-000d3a392eb5)/copy
Correct Answer: A 🗳️
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