Study guide for Exam MB-820: Microsoft Dynamics 365 Business Central Developer

Purpose of this document

This study guide should help you understand what to expect on the exam and includes a summary of the topics the exam might cover and links to additional resources. The information and materials in this document should help you focus your studies as you prepare for the exam.

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About the exam


Some exams are localized into other languages. You can find these in the Schedule Exam section of the Exam Details webpage. If the exam isn’t available in your preferred language, you can request an additional 30 minutes to complete the exam.


The bullets that follow each of the skills measured are intended to illustrate how we are assessing that skill. Related topics may be covered in the exam.


Most questions cover features that are general availability (GA). The exam may contain questions on Preview features if those features are commonly used.

Skills measured

Audience profile

As a Microsoft Dynamics 365 Business Central developer, you’re responsible for designing, developing, testing, and maintaining solutions based on Dynamics 365 Business Central. In this role, you develop apps that extend Business Central, including customizing or adding extra functionality. You also integrate Business Central with other applications, such as Microsoft Power Platform products. Plus, you need to ensure that data remains current during an upgrade process.

As a Business Central developer, you’re responsible for troubleshooting and debugging issues in the system. This may involve:

  • Identifying the root cause of a problem.

  • Fixing bugs.

  • Testing the solution to ensure that it works as expected.

You may be required to optimize the performance of the system by:

  • Identifying bottlenecks.

  • Improving code quality.

You must have applied knowledge of Business Central and the application language (AL), the development environment, and other tools to develop extensions for it. You need some knowledge of how to install and upgrade the system. You should also understand:

  • Industry terminology.

  • The Business Central role in relationship to Microsoft 365 and Dynamics 365.

As a developer, you should have knowledge of:

  • AppSource, Business Central–related technologies, frameworks, and services to build solutions.

  • Technologies for application lifecycle management (ALM), including source control management (SCM) and continuous integration and continuous delivery (CI/CD).

Skills at a glance

  • Describe Business Central (10–15%)

  • Install, develop, and deploy for Business Central (10–15%)

  • Develop by using AL objects (35–40%)

  • Develop by using AL (15–20%)

  • Work with development tools (10–15%)

  • Integrate Business Central with other applications (10–15%)

Describe Business Central (10–15%)

Describe the Business Central architecture

  • Describe the components and capabilities of Business Central

  • Describe the core solution and extensions approach for Business Central

  • Describe the update lifecycle for customizations of Business Central

  • Differentiate Business Central Online and Business Central on-premises features

Describe Business Central apps

  • Differentiate between the base app and the system app

  • Describe the functionality of apps

  • Describe the process of bringing an app to AppSource

Install, develop, and deploy for Business Central (10–15%)

Install and configure a Business Central development environment

  • Describe the development environment for Business Central

  • Install and configure the development environment

  • Manage JSON configuration files

  • Manage multiple AL extensions in one workspace

Create, debug, and deploy an extension in Business Central

  • Debug an extension with Visual Studio Code

  • Deploy an extension

  • Create or modify a Business Central extension in Visual Studio Code

  • Manage multilanguage development

  • Maintain extensions

Develop by using AL objects (35–40%)

Build and extend tables and pages in Business Central

  • Develop Role Center pages

  • Identify different page types

  • Build and extend page objects

  • Build and extend tables

  • Build and extend enums

Build and extend reports

  • Substitute a report

  • Create a report layout

  • Create document reports

  • Design the data model of a report

  • Implement multilanguage in reports

  • Use report triggers, functions, and processing-only reports

  • Develop the report request page

Design and create an XMLport

  • Configure different XMLport properties

  • Define nodes and their properties

  • Use XMLports in AL code

Develop codeunits

  • Create and access codeunits

  • Use events and triggers

  • Implement interfaces

  • Create installation and upgrade codeunits

Work with entitlement and permission set objects

  • Create and extend permission sets

  • Override entitlements with inherent permissions

  • Troubleshoot permission sets

Create queries in Business Central

  • Link and join data items

  • Apply filters in query objects

  • Use queries instead of record variables

  • Aggregate data in query objects

  • Use a query to create a report

Develop by using AL (15–20%)

Customize the UI experience and implement onboarding techniques

  • Create profiles in AL

  • Use and create views in AL

  • Develop the UI by using the user assistance model

  • Integrate assisted setup

  • Create teaching tips and in-app tours to onboard users

  • Create an onboarding checklist

Describe the essential development standards

  • Implement the data process model in Business Central

  • Define the different functional table types and characteristics

  • Use document standards in Business Central

  • Implement master data standards and design patterns

Use AL to extend Business Central

  • Create custom procedures

  • Differentiate data types

  • Manage files

  • Manipulate data by using code

  • Describe the basics of the AL

  • Use the different types of expressions

  • Work with AL built-in functions and AL statements

  • Work with variables and define them in AL code

  • Manage errors

  • Use access modifiers to limit access

Work with development tools (10–15%)

Implement semi-automated test processes and run standard Business Central tests

  • Test applications in Business Central

  • Install and run the Test Toolkit

  • Develop test codeunits and procedures

Manage and analyze telemetry

  • Monitor and analyze telemetry

  • Configure telemetry

  • Create custom telemetry signals

Integrate Business Central with other applications (10–15%)

Access Representational State Transfer (REST) services from within Business Central

  • Use the different HTTP classes and their functions

  • Get data from and send data to an external REST service

  • Use and read JSON

Implement APIs

  • Create and work with APIs

  • Manage UI interaction when working with web services

  • Use Read-Scale Out to improve performance

Study resources

We recommend that you train and get hands-on experience before you take the exam. We offer self-study options and classroom training as well as links to documentation, community sites, and videos.

Study resources Links to learning and documentation
Get trained Choose from self-paced learning paths and modules or take an instructor-led course
Find documentation Dynamics 365 documentation and learning modules
AL for Business Central documentation
Business Central documentation
Ask a question Microsoft Q&A | Microsoft Docs
Get community support Microsoft Dynamics Community
Follow Microsoft Learn Microsoft Learn - Microsoft Tech Community
Find a video Exam Readiness Zone
Browse other Microsoft Learn shows