Microsoft MB-820 : Microsoft Dynamics 365 Business Central Developer

  • Exam Code: MB-820
  • Exam Name: Microsoft Dynamics 365 Business Central Developer
  • Updated: Nov 07, 2026     Q & A: 130 Questions and Answers

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Microsoft MB-820 Exam Syllabus Topics:

TopicDetails
Topic 1
  • Work with development tools: Implementing semi-automated test processes and managing and assessing telemetry are its sub-topics.
Topic 2
  • Integrate Business Central with other applications: Accessing Representational State Transfer (REST) services is discussed in this topic. It also explains implementation of APIs.
Topic 3
  • Install, develop, and deploy for Business Central: It delves into the installation and configuration of a Business Central development environment. Moreover, it discusses creating, debugging, and deploying an extension in Business Central.
Topic 4
  • Develop by using AL objects: Building and extending tables and reports is discussed in this topic. It also explains Designing and creating an XMLport. Lastly, it discusses how to work with entitlement and permission set objects.
Topic 5
  • Describe Business Central: Describing the components and capabilities of Business Central, and describing the core solution and extensions approach for Business Central are focal points of this topic. It also explains the difference between Business Central Online and Business Central on-premises features.

Reference: https://learn.microsoft.com/en-gb/credentials/certifications/resources/study-guides/mb-820

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Microsoft Dynamics 365 Business Central Developer Sample Questions:

Question #1

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 IncludedPermissionSets property to Permission Set A.
Does the solution meet the goal?

  • A. Yes
  • B. No
Reveal Solution  Discussion  0

Correct Answer: B  🗳️

Question #2

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.

Reveal Solution  Discussion  0

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.

Question #3

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 Included Permission Sets property to Permission Set B and the Excluded PermissionSets property to Permission Set A.
Does the solution meet the goal?

  • A. Yes
  • B. No
Reveal Solution  Discussion  0

Correct Answer: B  🗳️

Question #4

You are creating a page extension for the Customer List page in a Dynamics 365 Business Central extension.
The extension must provide the following implementation:
* The page view must show only customers with Balance Due (LCY) > 1000 and with Country/Region Code
= US.
* The view must display only some custom fields from the Customer table.
You need to define the page view and the required filter.
Which two actions should you perform? Each correct answer presents part of the solution. Choose two.
NOTE Each correct selection is worth one point.

  • A. Define a new view in the views section of the page.
  • B. Define a new view in the layout section of the page.
  • C. Add the property sharedLayout = true;
  • D. Define a new view in the actions section of the page.
  • E. Add the property sharedLayout = false;
Reveal Solution  Discussion  0

Correct Answer: A,C  🗳️

Question #5

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.
F

Reveal Solution  Discussion  0

Correct Answer:


Explanation:

var
TempBlob: Codeunit " Temp Blob " ;
IncidentOutStream: OutStream;
IncidentInStream: InStream;
ImageFilter, FileName: Text;
begin
// Initialize the TempBlob and streams
TempBlob.CreateOutStream(IncidentOutStream);
Rec.Image.ExportStream(IncidentOutStream); // ' Rec ' refers to the current Room Incident record TempBlob.CreateInStream(IncidentInStream);
// Set the filters and filename for the image
ImageFilter := ' Image Files (*.bmp,*.jpg,*.jpeg,*.gif)|*.bmp;*.jpg;*.jpeg;*.gif ' ; FileName := ' Customer Picture ' ;
// Prompt the user to download the image
if not DownloadFromStream(IncidentInStream, ' ' , ' Download Incident Picture ' , ' ' , ImageFilter, FileName) then Error( ' Unable to download the image. ' ); end;

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