What is the purpose of an event in AL?

To allow external code to react to specific actions or changes

What is the purpose of an interface in AL?

To define a contract of methods that implementing codeunits must provide

To store data in a structured format

To handle events raised by other objects

To define the user interface of a page

A developer has a codeunit that posts sales invoices. The developer wants to allow other extensions to perform additional validation before the invoice is posted, without modifying the original codeunit. The validation should be able to cancel the posting if it fails. Which approach should the developer use?

Publish an event before the posting logic and use a var parameter to allow subscribers to set a flag that cancels the posting.

Create a new codeunit that wraps the original posting codeunit and adds validation.

Use a table trigger on the Sales Invoice Header table to validate before insert.

Publish an event after the posting logic and let subscribers undo the posting if validation fails.

Microsoft Certified:Dynamics 365 Business Central Developer Associate

Domain 3Objective 4

Develop Codeunits MB-820 Practice Questions (Page 2)

Part of the Develop by using AL objects domain, which accounts for 35–40% of the MB-820 exam. Microsoft does not publish an official question count, but from its 100-minute exam (~40–65 total, ~14–26 in this domain), expect 2–4 from this objective — we provide 25 practice questions to prepare you well beyond it. (estimate)

25questions here

5free pages

7concepts

35–40%of the exam

Questions 6–10

6foundation · easy
What is the purpose of an event in AL?
Select an answer first
7foundation · easy
Which property must be set to true to designate a codeunit as an installation codeunit?
Select an answer first
8foundation · easy
What is the purpose of an interface in AL?
Select an answer first
9application · medium
A developer has a codeunit that posts sales invoices. The developer wants to allow other extensions to perform additional validation before the invoice is posted, without modifying the original codeunit. The validation should be able to cancel the posting if it fails. Which approach should the developer use?
Select an answer first
10foundation · easy
What is the default access modifier for a method in a codeunit?
Select an answer first

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Develop Codeunits MB-820 Practice Questions (Page 2)

Questions 6–10

What is the purpose of an event in AL?

Which property must be set to true to designate a codeunit as an installation codeunit?

What is the purpose of an interface in AL?

What is the default access modifier for a method in a codeunit?

Keep studying — Develop by using AL objects