Develop Codeunits MB-820 Practice Questions (Page 1)

Questions 1–5

1. 1application · medium

   A developer has a codeunit that processes purchase orders. The developer wants to allow other extensions to react after a purchase order is processed, but they should not be able to modify the processing logic. Which event pattern should the developer use?

   • AUse a table trigger to react to changes.
   • BPublish an event after the processing logic completes.
   • CCreate a new codeunit that wraps the original and adds logic after calling it.
   • DPublish an event before the processing logic with a var parameter.
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2. 2application · medium

   A developer creates a codeunit that validates customer addresses. The codeunit is called from a page action and also from a report before processing. The validation logic must run every time the codeunit is invoked, regardless of the caller. Which trigger should the developer implement in the codeunit to ensure the validation logic runs automatically?

   • AOnInsert trigger
   • BOnRun trigger
   • COnBeforeAction trigger
   • DOnValidate trigger
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4. 3application · medium

   A company uses a Business Central extension that calculates discounts in a codeunit named DiscountCalculator. Another extension needs to adjust the discount for a specific customer group without modifying the original code. The developer wants to subscribe to an event that the DiscountCalculator publishes after the discount is calculated, but before it is applied to the sales line. Which approach should the developer use?

   • ACreate an event subscriber codeunit that subscribes to the published event and modifies the discount value via a var parameter.
   • BAdd a global variable in DiscountCalculator to store the adjusted discount and have the other extension modify it directly.
   • CUse the OnBeforeInsert trigger on the Sales Line table to recalculate the discount after the codeunit runs.
   • DCopy the DiscountCalculator codeunit into the new extension and modify the copy to include the customer group logic.
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5. 4application · medium

   A developer needs to create a reusable routine that calculates the total weight of items in a sales order. The routine will be called from multiple pages and reports. The developer wants to encapsulate the logic in a single place. What should the developer create?

   • AA page extension that includes the calculation logic in the OnAfterGetRecord trigger.
   • BA table extension that adds a field to store the total weight.
   • CA codeunit with a procedure that accepts the sales order ID and returns the total weight.
   • DA report that calculates the weight and displays it.
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6. 5foundation · easy

   How do you indicate that a codeunit implements an interface in AL?

   • Acodeunit 50100 MyCodeunit implements MyInterface
   • Bcodeunit 50100 MyCodeunit extends MyInterface
   • Ccodeunit 50100 MyCodeunit : MyInterface
   • Dcodeunit 50100 MyCodeunit with MyInterface
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