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Actualkey Prepration Latest MB-820 : Microsoft Dynamics 365 Business Central Developer Exam Questions and Answers PDF's, Verified Answers via Experts - Pass Your Exam For Sure and instant Downloads - "Money Back Guarantee".

Vendor Microsoft
Certification Microsoft Dynamic 365
Exam Code MB-820
Title Microsoft Dynamics 365 Business Central Developer Exam
No Of Questions 56
Last Updated May 1,2024
Product Type Q & A with Explanation
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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.

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

Sample Question and Answers


New Topic: Topic 1 , Case Study Alpine Ski House

Alpine Ski House is a company that owns and operates hotels, restaurants, and stores. Currently,
the company uses the following software and interlace:
Property management software (PMS) to manage hotel rooms
On-premises accounting software to generate sales invoices and create purchase orders
An API that allows restaurants and stores to obtain necessary information
Restaurants and stores use standalone software for point of sale (POS) devices. Each day, the POS
terminals generate a text file of sales data and save the files in a serval folder. An account assistant
must manually import the files to the current software tables to be processed by the system.
The general manager receives several reports monthly from department managers.
The reports take too much time to prepare.

The company is moving from a different system to 8usiness Central online to manage the whole company.
The company plans to increase efficiency in every department by using APIs to obtain or share
information between the different systems.

Each department involved in purchasing must be able to make purchase requests automatically and easily.
The departments do not need access to the full ERP management system.
Alpine Ski House requires the development of several extensions for the planned improvements.
Business Central design patterns must be used to develop all extensions.

Alpine Ski House must develop the following pages:
Pages that provide multiple configurations in a multistep dialog, like a wizard, to provide
required information when the extensions are first installed
Department-specific Role Center pages to show relevant information and pages with additional information
The IT department plans to use Power 61 to analyze departmental information. The database must be configured to provide optimal performance.
The housekeeping department requires the following to increase efficiency and help avoid data entry errors:
A Housekeeping Role Center to minimize navigation to relevant areas In Business Central online and to show relevant information in it
Pages to embed into a new Room page to show additional information about the Room entity
A table named Room Incident for the housekeeping team to enter room issue information
A Housekeeping canvas app that connects to an extension The department requires the development of an extension with a new API page named RoomsAPI.
The housekeeping team will use RoomsAPI to publish room details, update when work is
complete, or provide repair notifications from the canvas app.
This custom API page must expose a custom table named Rooms and have an ID 50000.
The table must be able to update from the PMS. The PMS team must know the end to connect to the custom API.
A developer provides the following details for the API page:
APIPublisher = 'alpine';
APIGroup - 'integration';
APIVersion - 'v2.6';
fntityName â– 'room';
EntitySetName = 'rooms';
The extension must be published in Business Central online and include a list page named Room List that includes all hotel rooms.

Installation or updates to this extension must meet the following requirements:
o Some web services must be published automatically.
o The version of the specified application's metadata must be obtained in AL language.
o The code required to perform tasks cannot be accessible from other parts of the application.

The Room Incident table information must include the following fields:
Incident entry: An incremental number
Room No.: A room from the Room table

Incident Date: The work date
o The table definition in the Room Incident table must autofill the Incident Date when the
housekeeping team inserts a new record, o The value for Incident Date must be the work date
configured in the Business Central online client.

Status: Includes the following options lo identify the status of the incident:
o Open: When the Room Incident is created
o In Progress: When someone starts repair work
o Closed: When the incident is solved
Incident Closing Date: Auto-updating field (when the status passes to Closed, the field will update with the work date)
Incident Description: Text

Image. Media data type
o The stored picture must be downloadable from a menu action.
o A Room Incident page must be developed to contain the download action.
To increase efficiency, the new system must manage the generated data from the restaurants and
stores directly by using the API on the POS terminals.
The company requires a code unit called from a job queue to read the information from the POS terminal APIs.
The POS terminal information must be stored in a table named POS Information, have an ID 50100. and be editable on a page.
The account manager requires an option on the menu of the page to run the process manually.
To analyze the information received from the POS terminals, the company requires:
A custom API named ticketAPI to export the information to Power BI
Use of the Read Scale-Out feature to improve database performance
The purchasing department requites a new entity in Business Central online to log non-conformities
of goods received from vendors. The entity must be set up as follows:
The non-conformity entity must have two tables:
o a header with common information
o one or more lines with the detailed received items that are non-conforming
The entity requires a page named Non-conformity and a subpage named Non-Conformity Lines
to store the information.
When a purchase order with incorrect quantity 01 quality issues is received, the entity must create a
non-conformity document in the system. The following information must be nick the document:
Non-conformity Number: must use the No. Series table from Business Central online to manage
this field and use these features:
o Alphanumeric values
o Number format that includes "NO and the year as part of the number: for example, NC24-001
Non-conformity Date: stores only the creation date
Vendor No.: stores the number of the vendor that sent the items; only vendors from the
company must be included
Owner: code of an employee defined in the company
Receipt No.: must meet the following conditions:
o Be an existing receipt No.
o Be received from the vendor indicated in the Vendor No. field
Comments: can include comments with rich text and pictures to illustrate quality problems »
Status: includes nonconformity statuses, such as:
o Open
o Notified
o Closed
Lines must contain the following details:
o Item No.: item received (for existing inventory items only)
o Description: item description
0 Quantity: non-conforming quantity
0 Non-conformity Type:
â– Quality
â– Quantity
â– Delivery date
The serial numbers of the non-conformities and the period in which they can be created must be in a
configuration table and its corresponding page to allow them to be modified for the users.

You need to download a stored picture from the Room Incident page.
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.


var TempBlob: Codeunit "Temp Blob";
IncidentOutStream: OutStream;
IncidentInStream: InStream;
ImageFilter, FileName: Text;