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Exam MB-820 Topic 1 Question 117 Discussion

Actual exam question for Microsoft's MB-820 exam
Question #: 117
Topic #: 1
You have a per tenant extension that contains the following code.

For each of the following statements, select Yes if the statement is true. Otherwise, select No.
NOTE: Each correct selection is worth one point.

Suggested Answer:


Explanation:
* Codeunit "Discount Mgmt." compiles successfully. = NO
* VariantLine in line 17 must be changed to Line and the DiscountAmount removed for the codeunit to compile. = NO
* The DiscountIsValid method must be defined in the interface for the code to compile. = YES The codeunit "Discount Mgmt." will not compile successfully as is because the DiscountIsValid method is not defined in the "IDiscount Calculation" interface, yet it is being declared in the codeunit which implements this interface. AL requires that all procedures in the codeunit that implements an interface must be defined in the interface itself.
The VariantLine in line 17 does not need to be changed to Line, nor does the DiscountAmount need to be removed for the codeunit to compile. These are valid declarations in AL and they are correctly implemented in the codeunit. The Variant data type in AL is used to handle various data types and DiscountAmount is a valid return type for a procedure.
For the code to compile successfully, the DiscountIsValid method must be included in the interface because AL enforces that any codeunit implementing an interface must implement all the methods defined in that interface.

by Nick at May 11, 2026, 01:50 AM

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