Free resources look tempting until you realize half of them contradict the other half. Instead of burning 2026 evenings sorting signal from noise, MB-820 candidates can start with the 173 verified Microsoft Dynamics 365 Business Central Developer practice questions at ValidDumps and spend that time actually learning.
| Certification Vendor: | Microsoft |
|---|---|
| Exam Name: | Microsoft Dynamics 365 Business Central Developer |
| Exam Number: | MB-820 |
| Passing Score: | 700 (on a scale of 1–1000) |
| Certificate Validity Period: | 1 year |
| Real Exam Qty: | 40–60 |
| Available Languages: | English |
| Exam Price: | $165 USD |
| Exam Format: | Multiple choice, Active screen, Drag and drop, Build list, Case studies |
| Exam Duration: | 90 minutes |
| Recommended Training: | Microsoft Learn: Dynamics 365 Business Central Developer Learning Paths |
| Exam Registration: | Pearson VUE Microsoft Learn Exam Registration |
| Sample Questions: | ![]() |
| Exam Way: | Online proctored or onsite testing center |
| Pre Condition: | Recommended: 1–2 years experience developing Business Central solutions, familiarity with AL language, Visual Studio Code, and development lifecycle |
| Official Syllabus URL: | https://learn.microsoft.com/en-us/credentials/certifications/resources/study-guides/mb-820 |
| Section | Weight | Objectives |
|---|---|---|
| Work with development tools | 10–15% | - Telemetry and diagnostics - Source control integration - Visual Studio Code for AL development - AL Language extension |
| Integrate Business Central with other applications | 10–15% | - Authentication and security for integration - Use APIs and web services - Power Platform integration - External data connections |
| Develop by using AL objects | 35–40% | - Create pages and reports
- Codeunits and procedures
|
| Describe Business Central | 10–15% | - Describe Business Central architecture - Describe update lifecycle for customizations - Describe Business Central apps
- Describe solution and extension approach - Differentiate online and on-premises features |
| Install, develop, and deploy for Business Central | 10–15% | - Set up development environment
|
| Develop by using AL | 15–20% | - AL syntax and programming concepts - Performance optimization - Error handling and logging - Security and permissions - Data manipulation and validation |
Microsoft Dynamics 365 Business Central Developer is an official Microsoft certification exam, listed under the code MB-820. Clearing it earns the Microsoft Certified: Dynamics 365 Business Central Developer Associate certification, a Associate-level credential. For employers, the value is simple: the vendor itself has verified what you know.
You will work through 40–60 questions in 90 minutes on the Microsoft Dynamics 365 Business Central Developer exam. The content is only half the battle; the clock is the other half. Train both at once: set the ValidDumps test engine to full timed mode, practice skipping and returning to stubborn items, and repeat until finishing with minutes to spare feels normal rather than lucky.
Passing Microsoft Dynamics 365 Business Central Developer requires 700 (on a scale of 1–1000), and the official registration fee is $165 USD. Remember that a retake bills the same $165 USD all over again, so winging it is the most expensive strategy on the table. A better approach: benchmark yourself with the ValidDumps practice tests first, and schedule the real exam only once your scores sit comfortably and consistently above the requirement.
Recommended: 1–2 years experience developing Business Central solutions, familiarity with AL language, Visual Studio Code, and development lifecycle
Requirements do evolve, so before you spend a registration fee, verify the current conditions on the official exam page.
Registration for Microsoft Dynamics 365 Business Central Developer is handled through the vendor's official channels below.
One more detail for your planning: the exam is delivered Online proctored or onsite testing center.
Microsoft recommends the following training resources for the Microsoft Dynamics 365 Business Central Developer exam.
Training tells you what to learn; practice questions teach you how the exam asks it. Pair either with the 173 items in the ValidDumps MB-820 package and you cover both halves.
Yes. The free demo on this page contains a portion of the complete Microsoft Dynamics 365 Business Central Developer question set, enough to judge the accuracy and the clarity of the explanations for yourself. After purchase, updates are free for 365 days, and once your product expires you can extend the update service at a 50% discount.
ValidDumps provides a 100% money-back guarantee with clearly stated conditions. Take the Microsoft Dynamics 365 Business Central Developer exam within 60 days of purchase; if you fail, you may claim a full refund, as long as the exam matches your product. Exams taken within 3 days of purchase are not eligible, and neither are products that were downloaded but never used, free materials, or expired orders; the candidate name must match the payer name. File the claim with a scanned enrollment slip and the official Score Report PDF within 2 days of the exam, and it is processed within 7 days. If you would rather exchange than refund, you can receive two other exam products of equal value free of charge and keep the update service on your original purchase.
Delivery is immediate: your purchase is downloadable right away and automatically emailed to you within one minute of successful payment. If nothing arrives within 2 hours, check your spam folder and contact customer service. You may install the software on as many computers as you wish.
The official Microsoft Dynamics 365 Business Central Developer syllabus comprises 6 domains. The heaviest hitters are Integrate Business Central with other applications (10–15%), Work with development tools (10–15%), and Install, develop, and deploy for Business Central (10–15%). The complete outline sits above on this page; walk it top to bottom and mark every line you could not teach to someone else.
Hotspot Question
A company uses Business Central. The company is generating a detailed custom report.
A user observes that the generated report dataset contains more Delivery Line records than expected for one specific Delivery Header.
You need to generate a report that contains the accurate number of records.
For each of the following statements, select Yes if the statement is true. Otherwise, select No.
NOTE: Each correct selection is worth one point.
Correct Answer:

Hotspot Question
A company is setting up a custom telemetry trace signal to send traces on failed customer statement emails.
For each of the following statements, select Yes if the statement is true. Otherwise, select No.
NOTE: Each correct selection is worth one point.
Correct Answer:

A customer needs a personalized home page for warehouse workers, including a specific set of actions and a navigation menu.
Which object should you create?
Correct Answer: D 🗳️
Explanation: Only visible for ValidDumps members. You can sign-up / login (it's free).
Hotspot Question
You have a column in a report.
You receive the following warning from CodeCop:
"Field 'Home Page' is marked for removal. Reason: Field length will be
increased to 255.. AL(AL0432)"
You have the following code:
1 column(CompanyHomePage; CompanyInformation."Home Page")
2 {
3 }
For each of the following statements, select Yes if the statement is true, Otherwise, select No.
NOTE: Each correct selection is worth one point.
Correct Answer:

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.
Hotspot Question
You need to parse the API JSON response and retrieve each order no. in the response body.
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:

Explanation:
Box 1: JToken.ReadFrom(Data)
In Dynamics 365 Business Central (AL language), the standard way to parse a JSON string into a usable JSON object or token is by calling the static method ReadFrom on a JsonToken variable.
Because a JsonToken is a base container that can hold either a JsonObject, JsonArray, or a primitive value, it safely reads the incoming payload into your JTOKEN variable using JTOKEN.ReadFrom(Data); Box 2: JObject.SelectToken('results', JToken); In Microsoft Dynamics 365 Business Central (AL language), the JsonObject.SelectToken method takes two arguments: the path string (e.g., 'results') and an out variable of type JsonToken to store the result. It returns a boolean indicating whether the token was found. Since JObject and JToken are already declared in your variables, this properly retrieves the results array token.
Box 3: If JObject.SelectToken(TokenValue, JToken) then
If JObject.SelectToken(TokenValue, JToken) then is the correct code to substitute for the placeholder X.
In Microsoft Dynamics 365 Business Central (AL language), the JsonObject.SelectToken method is used to find a nested token by its path.
Syntax: JsonObject.SelectToken(Path: Text, var Token: JsonToken): Boolean Behavior: It takes the path string (in this case, the parameter TokenValue which holds 'order_no') as the first argument, and stores the found result in the JToken variable passed by reference as the second argument. It returns a boolean (true if the token is found), making it perfect for an if conditional check before extracting its value.
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