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Microsoft MB-820 Bundle

Exam Code: MB-820

Exam Name Microsoft Dynamics 365 Business Central Developer

Certification Provider: Microsoft

Corresponding Certification: Microsoft Certified: Dynamics 365 Business Central Developer Associate

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Microsoft Dynamics 365 Business Central Developer (MB-820) Practice Tests

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Microsoft MB-820 Practice Test 3

Question 20

At fictional Orchard Agriculture, the Business Central development team is supporting farm supplier procurement and reviewing AL business logic and user experience during a code quality review (MB820-4.3-147). The observed development issue is that an extension assumes FindFirst will always find a matching ledger row and crashes when the set is empty. Which observed result would most clearly show the intended correction works?

  1. Only records matching the verified customer criteria are processed.
  2. Totals remain mathematically correct across decimal precision and locale settings.
  3. Invalid values are rejected before record mutation and valid values are stored consistently.
  4. A missing record yields a defined outcome instead of an unexpected runtime error.

Explanation

Correct Answer

D:

This is the outcome that directly verifies the intended correction: a missing record yields a defined outcome instead of an unexpected runtime error. The related solution is to check the Boolean result of the record lookup and handle not-found cases deliberately; it is based on the principle that record API success conditions must be handled explicitly.

Incorrect Answers

A:

“Only records matching the verified customer criteria are processed” concerns the alternative task “apply the intended record filter and validate current filter groups when composing queries”, but the stated failure is that an extension assumes FindFirst will always find a matching ledger row and crashes when the set is empty. The required measure is to a missing record yields a defined outcome instead of an unexpected runtime error.

B:

The proposed “Totals remain mathematically correct across decimal precision and locale settings” tests a different control: use a suitable Decimal variable and numeric expressions, formatting only at display boundaries. The reported condition is that an extension assumes FindFirst will always find a matching ledger row and crashes when the set is empty; the more direct action is to a missing record yields a defined outcome instead of an unexpected runtime error.

C:

“Invalid values are rejected before record mutation and valid values are stored consistently” supports the separate task “use appropriate AL types, validation logic and explicit procedure parameters”, not the reported problem: an extension assumes FindFirst will always find a matching ledger row and crashes when the set is empty. This case instead calls for “A missing record yields a defined outcome instead of an unexpected runtime error”.

Question 21

At fictional Juniper Hospitality, the Business Central development team is supporting property purchasing and billing and reviewing solution architecture design during an integration contract review (MB820-1.1-010). The observed development issue is that a partner promises identical filesystem access and server administration in cloud and on-premises Business Central. Which AL development or design response most directly addresses this issue?

  1. Select supported Business Central capabilities and explicit service integrations for Microsoft 365 workflows.
  2. Separate independently maintained capabilities into versioned extension apps with explicit dependencies.
  3. Assess deployment-specific restrictions and select cloud-compatible APIs when SaaS must be supported.
  4. Track the platform release cycle and qualify extension versions against available compatibility signals.

Explanation

Correct Answer

C:

The most direct corrective response is to assess deployment-specific restrictions and select cloud-compatible APIs when SaaS must be supported. This addresses the specific failure where a partner promises identical filesystem access and server administration in cloud and on-premises Business Central. Acceptance evidence is that the feature runs without file-system or server-administration privileges in the online target.

Incorrect Answers

A:

The proposed “Select supported Business Central capabilities and explicit service integrations for Microsoft 365 workflows” tests a different control: select supported Business Central capabilities and explicit service integrations for Microsoft 365 workflows. The reported condition is that a partner promises identical filesystem access and server administration in cloud and on-premises Business Central; the more direct action is to assess deployment-specific restrictions and select cloud-compatible APIs when SaaS must be supported.

B:

“Separate independently maintained capabilities into versioned extension apps with explicit dependencies” supports the separate task “separate independently maintained capabilities into versioned extension apps with explicit dependencies”, not the reported problem: a partner promises identical filesystem access and server administration in cloud and on-premises Business Central. This case instead calls for “assess deployment-specific restrictions and select cloud-compatible APIs when SaaS must be supported”.

D:

“Track the platform release cycle and qualify extension versions against available compatibility signals” concerns the alternative task “track the platform release cycle and qualify extension versions against available compatibility signals”, but the stated failure is that a partner promises identical filesystem access and server administration in cloud and on-premises Business Central. The required measure is to assess deployment-specific restrictions and select cloud-compatible APIs when SaaS must be supported.

Question 22

At fictional Juniper Hospitality, the Business Central development team is supporting property purchasing and billing and reviewing solution architecture design during an integration contract review (MB820-1.1-010). The observed development issue is that a partner promises identical filesystem access and server administration in cloud and on-premises Business Central. Which observed result would most clearly show the intended correction works?

  1. The feature runs without file-system or server-administration privileges in the online target.
  2. The extension deploys successfully to an online sandbox without a server-local .NET assembly.
  3. The customization is deployed as an app without overwriting Microsoft's application objects.
  4. A small module can be updated without rebuilding unrelated modules and dependency versions stay valid.

Explanation

Correct Answer

A:

This is the outcome that directly verifies the intended correction: the feature runs without file-system or server-administration privileges in the online target. The related solution is to assess deployment-specific restrictions and select cloud-compatible APIs when SaaS must be supported; it is based on the principle that deployment models differ in administrative and runtime capabilities.

Incorrect Answers

B:

“The extension deploys successfully to an online sandbox without a server-local .NET assembly” concerns the separate step “replace the server-specific .NET dependency with supported AL or external service integration appropriate to cloud execution”. The reported issue is that a partner promises identical filesystem access and server administration in cloud and on-premises Business Central, so the direct response is to the feature runs without file-system or server-administration privileges in the online target.

C:

“The customization is deployed as an app without overwriting Microsoft's application objects” concerns the alternative task “design a separate AL extension that adds the required fields and logic through supported extensibility points”, but the stated failure is that a partner promises identical filesystem access and server administration in cloud and on-premises Business Central. The required measure is to the feature runs without file-system or server-administration privileges in the online target.

D:

The proposed “A small module can be updated without rebuilding unrelated modules and dependency versions stay valid” tests a different control: separate independently maintained capabilities into versioned extension apps with explicit dependencies. The reported condition is that a partner promises identical filesystem access and server administration in cloud and on-premises Business Central; the more direct action is to the feature runs without file-system or server-administration privileges in the online target.

Question 23

At fictional Juniper Hospitality, the Business Central development team is supporting property purchasing and billing and reviewing solution architecture design during an integration contract review (MB820-1.1-010). The observed development issue is that a partner promises identical filesystem access and server administration in cloud and on-premises Business Central. Which Business Central or AL development principle best explains the right response?

  1. Deployment models differ in administrative and runtime capabilities.
  2. The System Application and Base Application serve different architectural responsibilities.
  3. Cross-product collaboration requires defined service boundaries.
  4. Tenant isolation is a security and data architecture boundary, not an implicit shared store.

Explanation

Correct Answer

A:

The governing principle is that deployment models differ in administrative and runtime capabilities. The engineering response is to assess deployment-specific restrictions and select cloud-compatible APIs when SaaS must be supported. Verification should show that the feature runs without file-system or server-administration privileges in the online target.

Incorrect Answers

B:

“The System Application and Base Application serve different architectural responsibilities” concerns the alternative task “use the System Application APIs for reusable system capabilities and extend the Base Application for business processes”, but the stated failure is that a partner promises identical filesystem access and server administration in cloud and on-premises Business Central. The required measure is to assess deployment-specific restrictions and select cloud-compatible APIs when SaaS must be supported.

C:

The proposed “Cross-product collaboration requires defined service boundaries” tests a different control: select supported Business Central capabilities and explicit service integrations for Microsoft 365 workflows. The reported condition is that a partner promises identical filesystem access and server administration in cloud and on-premises Business Central; the more direct action is to assess deployment-specific restrictions and select cloud-compatible APIs when SaaS must be supported.

D:

“Tenant isolation is a security and data architecture boundary, not an implicit shared store” supports the separate task “design explicit authorized integration rather than assuming Business Central tenant databases share company data”, not the reported problem: a partner promises identical filesystem access and server administration in cloud and on-premises Business Central. This case instead calls for “assess deployment-specific restrictions and select cloud-compatible APIs when SaaS must be supported”.

Question 24

At fictional Juniper Hospitality, the Business Central development team is supporting property purchasing and billing and reviewing solution architecture design during an integration contract review (MB820-1.1-010). The observed development issue is that a partner promises identical filesystem access and server administration in cloud and on-premises Business Central. Which recurring engineering check would best prevent this issue from returning?

  1. Rehearse extension compatibility against preview or sandbox release environments.
  2. Run online target and analyzer checks before accepting a technical design.
  3. Review customization requests for unsupported base-object replacement.
  4. Test extension deployment in each supported environment mode.

Explanation

Correct Answer

D:

The ongoing check is to test extension deployment in each supported environment mode. This helps detect recurrence when a partner promises identical filesystem access and server administration in cloud and on-premises Business Central. The associated correction is to assess deployment-specific restrictions and select cloud-compatible APIs when SaaS must be supported; a confirming result is that the feature runs without file-system or server-administration privileges in the online target.

Incorrect Answers

A:

“Rehearse extension compatibility against preview or sandbox release environments” concerns the alternative task “assign extension code ownership and compatibility testing to the publisher while Microsoft maintains the online platform”, but the stated failure is that a partner promises identical filesystem access and server administration in cloud and on-premises Business Central. The required measure is to test extension deployment in each supported environment mode.

B:

The proposed “Run online target and analyzer checks before accepting a technical design” tests a different control: replace the server-specific .NET dependency with supported AL or external service integration appropriate to cloud execution. The reported condition is that a partner promises identical filesystem access and server administration in cloud and on-premises Business Central; the more direct action is to test extension deployment in each supported environment mode.

C:

“Review customization requests for unsupported base-object replacement” supports the separate task “design a separate AL extension that adds the required fields and logic through supported extensibility points”, not the reported problem: a partner promises identical filesystem access and server administration in cloud and on-premises Business Central. This case instead calls for “Test extension deployment in each supported environment mode”.

Question 25

At fictional Pinewell Electronics, the Business Central development team is supporting equipment returns and invoicing and reviewing object model and application extensibility during a troubleshooting exercise (MB820-3.4-101). The observed development issue is that a pricing extension inserts a COMMIT inside a validation procedure and leaves half-completed transactions after a later error. Which recurring engineering check would best prevent this issue from returning?

  1. Use unit tests to detect divergent calculation paths.
  2. Scan high-impact extension code for unexpected commits.
  3. Review public procedures for unintended side effects.
  4. Add regression cases for alternate event paths.

Explanation

Correct Answer

B:

The ongoing check is to scan high-impact extension code for unexpected commits. This helps detect recurrence when a pricing extension inserts a COMMIT inside a validation procedure and leaves half-completed transactions after a later error. The associated correction is to review transaction boundaries and remove unintended commits from reusable business logic; a confirming result is that on an injected failure, related changes roll back consistently.

Incorrect Answers

A:

The proposed “Use unit tests to detect divergent calculation paths” tests a different control: move reusable logic to an appropriate codeunit and call it through a stable interface. The reported condition is that a pricing extension inserts a COMMIT inside a validation procedure and leaves half-completed transactions after a later error; the more direct action is to scan high-impact extension code for unexpected commits.

C:

“Review public procedures for unintended side effects” concerns the separate step “refactor it to accept explicit inputs and return a well-defined result without hidden mutable dependencies”. The reported issue is that a pricing extension inserts a COMMIT inside a validation procedure and leaves half-completed transactions after a later error, so the direct response is to scan high-impact extension code for unexpected commits.

D:

“Add regression cases for alternate event paths” concerns the alternative task “inspect the event signature and handle missing or incomplete values according to contract”, but the stated failure is that a pricing extension inserts a COMMIT inside a validation procedure and leaves half-completed transactions after a later error. The required measure is to scan high-impact extension code for unexpected commits.

Question 26

At fictional Pinewell Electronics, the Business Central development team is supporting equipment returns and invoicing and reviewing object model and application extensibility during a troubleshooting exercise (MB820-3.4-101). The observed development issue is that a pricing extension inserts a COMMIT inside a validation procedure and leaves half-completed transactions after a later error. Which Business Central or AL development principle best explains the right response?

  1. Explicit procedure contracts improve testability and reduce hidden state.
  2. Transaction control must respect business process atomicity.
  3. Error handling should protect data correctness, not merely user experience.
  4. Field validation triggers depend on the AL operation used.

Explanation

Correct Answer

B:

The governing principle is that transaction control must respect business process atomicity. The engineering response is to review transaction boundaries and remove unintended commits from reusable business logic. Verification should show that on an injected failure, related changes roll back consistently.

Incorrect Answers

A:

“Explicit procedure contracts improve testability and reduce hidden state” supports the separate task “refactor it to accept explicit inputs and return a well-defined result without hidden mutable dependencies”, not the reported problem: a pricing extension inserts a COMMIT inside a validation procedure and leaves half-completed transactions after a later error. This case instead calls for “review transaction boundaries and remove unintended commits from reusable business logic”.

C:

“Error handling should protect data correctness, not merely user experience” concerns the alternative task “preserve error meaning and stop or compensate the transaction rather than falsely reporting success”, but the stated failure is that a pricing extension inserts a COMMIT inside a validation procedure and leaves half-completed transactions after a later error. The required measure is to review transaction boundaries and remove unintended commits from reusable business logic.

D:

The proposed “Field validation triggers depend on the AL operation used” tests a different control: call the appropriate validation mechanism when business rules must run during programmatic updates. The reported condition is that a pricing extension inserts a COMMIT inside a validation procedure and leaves half-completed transactions after a later error; the more direct action is to review transaction boundaries and remove unintended commits from reusable business logic.

Question 27

At fictional Pinewell Electronics, the Business Central development team is supporting equipment returns and invoicing and reviewing object model and application extensibility during a troubleshooting exercise (MB820-3.4-101). The observed development issue is that a pricing extension inserts a COMMIT inside a validation procedure and leaves half-completed transactions after a later error. Which observed result would most clearly show the intended correction works?

  1. Unapproved external code cannot call the protected operation while authorized modules work.
  2. All five callers return consistent results from one tested implementation.
  3. On an injected failure, related changes roll back consistently.
  4. A simulated validation failure blocks completion with a useful diagnostic.

Explanation

Correct Answer

C:

This is the outcome that directly verifies the intended correction: on an injected failure, related changes roll back consistently. The related solution is to review transaction boundaries and remove unintended commits from reusable business logic; it is based on the principle that transaction control must respect business process atomicity.

Incorrect Answers

A:

“Unapproved external code cannot call the protected operation while authorized modules work” concerns the separate step “restrict the procedure's access with appropriate AL access modifiers and resource permissions”. The reported issue is that a pricing extension inserts a COMMIT inside a validation procedure and leaves half-completed transactions after a later error, so the direct response is to on an injected failure, related changes roll back consistently.

B:

“All five callers return consistent results from one tested implementation” concerns the alternative task “move reusable logic to an appropriate codeunit and call it through a stable interface”, but the stated failure is that a pricing extension inserts a COMMIT inside a validation procedure and leaves half-completed transactions after a later error. The required measure is to on an injected failure, related changes roll back consistently.

D:

“A simulated validation failure blocks completion with a useful diagnostic” supports the separate task “preserve error meaning and stop or compensate the transaction rather than falsely reporting success”, not the reported problem: a pricing extension inserts a COMMIT inside a validation procedure and leaves half-completed transactions after a later error. This case instead calls for “On an injected failure, related changes roll back consistently”.

Question 28

At fictional Pinewell Electronics, the Business Central development team is supporting equipment returns and invoicing and reviewing object model and application extensibility during a troubleshooting exercise (MB820-3.4-101). The observed development issue is that a pricing extension inserts a COMMIT inside a validation procedure and leaves half-completed transactions after a later error. Which AL development or design response most directly addresses this issue?

  1. Use distinct Install and Upgrade codeunits, implementing the appropriate lifecycle triggers.
  2. Subscribe to an appropriate published business event or design a reusable codeunit validation at the relevant process boundary.
  3. Refactor it to accept explicit inputs and return a well-defined result without hidden mutable dependencies.
  4. Review transaction boundaries and remove unintended commits from reusable business logic.

Explanation

Correct Answer

D:

The most direct corrective response is to review transaction boundaries and remove unintended commits from reusable business logic. This addresses the specific failure where a pricing extension inserts a COMMIT inside a validation procedure and leaves half-completed transactions after a later error. Acceptance evidence is that on an injected failure, related changes roll back consistently.

Incorrect Answers

A:

“Use distinct Install and Upgrade codeunits, implementing the appropriate lifecycle triggers” concerns the alternative task “use distinct Install and Upgrade codeunits, implementing the appropriate lifecycle triggers”, but the stated failure is that a pricing extension inserts a COMMIT inside a validation procedure and leaves half-completed transactions after a later error. The required measure is to review transaction boundaries and remove unintended commits from reusable business logic.

B:

The proposed “Subscribe to an appropriate published business event or design a reusable codeunit validation at the relevant process boundary” tests a different control: subscribe to an appropriate published business event or design a reusable codeunit validation at the relevant process boundary. The reported condition is that a pricing extension inserts a COMMIT inside a validation procedure and leaves half-completed transactions after a later error; the more direct action is to review transaction boundaries and remove unintended commits from reusable business logic.

C:

“Refactor it to accept explicit inputs and return a well-defined result without hidden mutable dependencies” supports the separate task “refactor it to accept explicit inputs and return a well-defined result without hidden mutable dependencies”, not the reported problem: a pricing extension inserts a COMMIT inside a validation procedure and leaves half-completed transactions after a later error. This case instead calls for “review transaction boundaries and remove unintended commits from reusable business logic”.

Question 29

At fictional Evergreen Print, the Business Central development team is supporting print production scheduling and reviewing AL business logic and user experience during an integration contract review (MB820-4.2-145). The observed development issue is that a warehouse team requests a numeric free-text status to model a process with named approval states. Which AL development or design response most directly addresses this issue?

  1. Use an appropriate enum/state model with controlled business transitions.
  2. Represent repeating related records with an appropriate child table and explicit relationship.
  3. Use supported posting codeunits and integration events to preserve core business invariants.
  4. Keep unposted documents and posted accounting entries separate in the lifecycle.

Explanation

Correct Answer

A:

The most direct corrective response is to use an appropriate enum/state model with controlled business transitions. This addresses the specific failure where a warehouse team requests a numeric free-text status to model a process with named approval states. Acceptance evidence is that records move only through permitted states and remain intelligible to users.

Incorrect Answers

B:

“Represent repeating related records with an appropriate child table and explicit relationship” supports the separate task “represent repeating related records with an appropriate child table and explicit relationship”, not the reported problem: a warehouse team requests a numeric free-text status to model a process with named approval states. This case instead calls for “use an appropriate enum/state model with controlled business transitions”.

C:

“Use supported posting codeunits and integration events to preserve core business invariants” concerns the separate step “use supported posting codeunits and integration events to preserve core business invariants”. The reported issue is that a warehouse team requests a numeric free-text status to model a process with named approval states, so the direct response is to use an appropriate enum/state model with controlled business transitions.

D:

“Keep unposted documents and posted accounting entries separate in the lifecycle” concerns the alternative task “keep unposted documents and posted accounting entries separate in the lifecycle”, but the stated failure is that a warehouse team requests a numeric free-text status to model a process with named approval states. The required measure is to use an appropriate enum/state model with controlled business transitions.

Question 30

At fictional Evergreen Print, the Business Central development team is supporting print production scheduling and reviewing AL business logic and user experience during an integration contract review (MB820-4.2-145). The observed development issue is that a warehouse team requests a numeric free-text status to model a process with named approval states. Which recurring engineering check would best prevent this issue from returning?

  1. Block direct mutation of posted business records in code review.
  2. Test concurrent document creation and number allocation.
  3. Validate state transition tests after adding status values.
  4. Run reconciliation tests after posting extensions.

Explanation

Correct Answer

C:

The ongoing check is to validate state transition tests after adding status values. This helps detect recurrence when a warehouse team requests a numeric free-text status to model a process with named approval states. The associated correction is to use an appropriate enum/state model with controlled business transitions; a confirming result is that records move only through permitted states and remain intelligible to users.

Incorrect Answers

A:

“Block direct mutation of posted business records in code review” supports the separate task “follow the documented posting and corrective-document patterns instead of editing immutable history”, not the reported problem: a warehouse team requests a numeric free-text status to model a process with named approval states. This case instead calls for “Validate state transition tests after adding status values”.

B:

“Test concurrent document creation and number allocation” concerns the separate step “use supported numbering and posting design patterns for document identifiers”. The reported issue is that a warehouse team requests a numeric free-text status to model a process with named approval states, so the direct response is to validate state transition tests after adding status values.

D:

The proposed “Run reconciliation tests after posting extensions” tests a different control: use supported posting codeunits and integration events to preserve core business invariants. The reported condition is that a warehouse team requests a numeric free-text status to model a process with named approval states; the more direct action is to validate state transition tests after adding status values.