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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 2

Question 10

At fictional Juniper Hospitality, the Business Central development team is supporting property purchasing and billing and reviewing extension environment and deployment preparation during a production readiness review (MB820-2.2-037). The observed development issue is that an emergency hotfix changes code but the app's manifest version is unchanged and the service rejects the expected upgrade. Which Business Central or AL development principle best explains the right response?

  1. Controlled deployment should promote tested artifacts rather than unverified rebuilds.
  2. Debugging does not constitute an extension rollback mechanism.
  3. Installation lifecycle hooks differ from ordinary page execution and upgrades.
  4. Versioned app identity is central to the extension lifecycle.

Explanation

Correct Answer

D:

The governing principle is that versioned app identity is central to the extension lifecycle. The engineering response is to increment the extension version and follow the supported package publish/upgrade path. Verification should show that the extension's installed version reflects the new artifact and data remains consistent.

Incorrect Answers

A:

“Controlled deployment should promote tested artifacts rather than unverified rebuilds” supports the separate task “promote a versioned extension artifact through sandbox acceptance before production deployment”, not the reported problem: an emergency hotfix changes code but the app's manifest version is unchanged and the service rejects the expected upgrade. This case instead calls for “increment the extension version and follow the supported package publish/upgrade path”.

B:

“Debugging does not constitute an extension rollback mechanism” concerns the separate step “separate debugger lifecycle from extension publish, install and uninstall procedures”. The reported issue is that an emergency hotfix changes code but the app's manifest version is unchanged and the service rejects the expected upgrade, so the direct response is to increment the extension version and follow the supported package publish/upgrade path.

C:

“Installation lifecycle hooks differ from ordinary page execution and upgrades” concerns the alternative task “use an installation codeunit with appropriate company initialization and idempotent setup”, but the stated failure is that an emergency hotfix changes code but the app's manifest version is unchanged and the service rejects the expected upgrade. The required measure is to increment the extension version and follow the supported package publish/upgrade path.

Question 11

At fictional Juniper Hospitality, the Business Central development team is supporting property purchasing and billing and reviewing extension environment and deployment preparation during a production readiness review (MB820-2.2-037). The observed development issue is that an emergency hotfix changes code but the app's manifest version is unchanged and the service rejects the expected upgrade. Which observed result would most clearly show the intended correction works?

  1. The extension's installed version reflects the new artifact and data remains consistent.
  2. The custom page loads on the target platform and key operations pass regression tests.
  3. A failed installation is detected before the release is marked successful.
  4. A locale switch displays reviewed translations without altering business logic.

Explanation

Correct Answer

A:

This is the outcome that directly verifies the intended correction: the extension's installed version reflects the new artifact and data remains consistent. The related solution is to increment the extension version and follow the supported package publish/upgrade path; it is based on the principle that versioned app identity is central to the extension lifecycle.

Incorrect Answers

B:

“The custom page loads on the target platform and key operations pass regression tests” concerns the alternative task “review compile or analyzer compatibility warnings and update the extension in a sandbox before installing the new version”, but the stated failure is that an emergency hotfix changes code but the app's manifest version is unchanged and the service rejects the expected upgrade. The required measure is to the extension's installed version reflects the new artifact and data remains consistent.

C:

The proposed “A failed installation is detected before the release is marked successful” tests a different control: separate publish, synchronize, install or upgrade and validation stages with explicit failure reporting. The reported condition is that an emergency hotfix changes code but the app's manifest version is unchanged and the service rejects the expected upgrade; the more direct action is to the extension's installed version reflects the new artifact and data remains consistent.

D:

“A locale switch displays reviewed translations without altering business logic” supports the separate task “use AL labels and language translation resources rather than embedding UI messages as literals”, not the reported problem: an emergency hotfix changes code but the app's manifest version is unchanged and the service rejects the expected upgrade. This case instead calls for “The extension's installed version reflects the new artifact and data remains consistent”.

Question 12

At fictional Juniper Hospitality, the Business Central development team is supporting property purchasing and billing and reviewing extension environment and deployment preparation during a production readiness review (MB820-2.2-037). The observed development issue is that an emergency hotfix changes code but the app's manifest version is unchanged and the service rejects the expected upgrade. Which AL development or design response most directly addresses this issue?

  1. Use AL labels and language translation resources rather than embedding UI messages as literals.
  2. Increment the extension version and follow the supported package publish/upgrade path.
  3. Separate debugger lifecycle from extension publish, install and uninstall procedures.
  4. Use supported VS Code AL launch or attach debugging with a matching sandbox and symbols.

Explanation

Correct Answer

B:

The most direct corrective response is to increment the extension version and follow the supported package publish/upgrade path. This addresses the specific failure where an emergency hotfix changes code but the app's manifest version is unchanged and the service rejects the expected upgrade. Acceptance evidence is that the extension's installed version reflects the new artifact and data remains consistent.

Incorrect Answers

A:

“Use AL labels and language translation resources rather than embedding UI messages as literals” concerns the alternative task “use AL labels and language translation resources rather than embedding UI messages as literals”, but the stated failure is that an emergency hotfix changes code but the app's manifest version is unchanged and the service rejects the expected upgrade. The required measure is to increment the extension version and follow the supported package publish/upgrade path.

C:

“Separate debugger lifecycle from extension publish, install and uninstall procedures” supports the separate task “separate debugger lifecycle from extension publish, install and uninstall procedures”, not the reported problem: an emergency hotfix changes code but the app's manifest version is unchanged and the service rejects the expected upgrade. This case instead calls for “increment the extension version and follow the supported package publish/upgrade path”.

D:

“Use supported VS Code AL launch or attach debugging with a matching sandbox and symbols” concerns the separate step “use supported VS Code AL launch or attach debugging with a matching sandbox and symbols”. The reported issue is that an emergency hotfix changes code but the app's manifest version is unchanged and the service rejects the expected upgrade, so the direct response is to increment the extension version and follow the supported package publish/upgrade path.

Question 13

At fictional Yorkshire Housing, the Business Central development team is supporting property service charges and reviewing AL business logic and user experience during an integration contract review (MB820-4.3-153). The observed development issue is that a developer needs to accumulate invoice amounts but stores intermediate numeric values as formatted text. Which AL development or design response most directly addresses this issue?

  1. Use appropriate Validate calls or supported update APIs before committing the record change.
  2. Use a suitable Decimal variable and numeric expressions, formatting only at display boundaries.
  3. Define clear procedures with appropriate parameter defaults or supported overload contracts.
  4. Handle errors explicitly and return or raise an accurate failure state.

Explanation

Correct Answer

B:

The most direct corrective response is to use a suitable Decimal variable and numeric expressions, formatting only at display boundaries. This addresses the specific failure where a developer needs to accumulate invoice amounts but stores intermediate numeric values as formatted text. Acceptance evidence is that totals remain mathematically correct across decimal precision and locale settings.

Incorrect Answers

A:

The proposed “Use appropriate Validate calls or supported update APIs before committing the record change” tests a different control: use appropriate Validate calls or supported update APIs before committing the record change. The reported condition is that a developer needs to accumulate invoice amounts but stores intermediate numeric values as formatted text; the more direct action is to use a suitable Decimal variable and numeric expressions, formatting only at display boundaries.

C:

“Define clear procedures with appropriate parameter defaults or supported overload contracts” concerns the separate step “define clear procedures with appropriate parameter defaults or supported overload contracts”. The reported issue is that a developer needs to accumulate invoice amounts but stores intermediate numeric values as formatted text, so the direct response is to use a suitable Decimal variable and numeric expressions, formatting only at display boundaries.

D:

“Handle errors explicitly and return or raise an accurate failure state” concerns the alternative task “handle errors explicitly and return or raise an accurate failure state”, but the stated failure is that a developer needs to accumulate invoice amounts but stores intermediate numeric values as formatted text. The required measure is to use a suitable Decimal variable and numeric expressions, formatting only at display boundaries.

Question 14

At fictional Yorkshire Housing, the Business Central development team is supporting property service charges and reviewing AL business logic and user experience during an integration contract review (MB820-4.3-153). The observed development issue is that a developer needs to accumulate invoice amounts but stores intermediate numeric values as formatted text. Which Business Central or AL development principle best explains the right response?

  1. Data types should represent semantics, not just printable appearance.
  2. Procedure design should minimize contradictory entry points.
  3. Shared business records need concurrency-aware mutation logic.
  4. Loop termination and record iteration are core control-flow requirements.

Explanation

Correct Answer

A:

The governing principle is that data types should represent semantics, not just printable appearance. The engineering response is to use a suitable Decimal variable and numeric expressions, formatting only at display boundaries. Verification should show that totals remain mathematically correct across decimal precision and locale settings.

Incorrect Answers

B:

“Procedure design should minimize contradictory entry points” concerns the separate step “define clear procedures with appropriate parameter defaults or supported overload contracts”. The reported issue is that a developer needs to accumulate invoice amounts but stores intermediate numeric values as formatted text, so the direct response is to use a suitable Decimal variable and numeric expressions, formatting only at display boundaries.

C:

“Shared business records need concurrency-aware mutation logic” concerns the alternative task “use a controlled concurrency/locking strategy and validate expected record state before updating”, but the stated failure is that a developer needs to accumulate invoice amounts but stores intermediate numeric values as formatted text. The required measure is to use a suitable Decimal variable and numeric expressions, formatting only at display boundaries.

D:

The proposed “Loop termination and record iteration are core control-flow requirements” tests a different control: use a correct AL iteration pattern with repeat/until and Next() or suitable FindSet traversal. The reported condition is that a developer needs to accumulate invoice amounts but stores intermediate numeric values as formatted text; the more direct action is to use a suitable Decimal variable and numeric expressions, formatting only at display boundaries.

Question 15

At fictional Yorkshire Housing, the Business Central development team is supporting property service charges and reviewing AL business logic and user experience during an integration contract review (MB820-4.3-153). The observed development issue is that a developer needs to accumulate invoice amounts but stores intermediate numeric values as formatted text. Which observed result would most clearly show the intended correction works?

  1. The process terminates after exactly the targeted rows.
  2. Totals remain mathematically correct across decimal precision and locale settings.
  3. A simulated validation error blocks posting and gives useful diagnostics.
  4. Invalid values are rejected before record mutation and valid values are stored consistently.

Explanation

Correct Answer

B:

This is the outcome that directly verifies the intended correction: totals remain mathematically correct across decimal precision and locale settings. The related solution is to use a suitable Decimal variable and numeric expressions, formatting only at display boundaries; it is based on the principle that data types should represent semantics, not just printable appearance.

Incorrect Answers

A:

“The process terminates after exactly the targeted rows” concerns the separate step “use a correct AL iteration pattern with repeat/until and Next() or suitable FindSet traversal”. The reported issue is that a developer needs to accumulate invoice amounts but stores intermediate numeric values as formatted text, so the direct response is to totals remain mathematically correct across decimal precision and locale settings.

C:

The proposed “A simulated validation error blocks posting and gives useful diagnostics” tests a different control: handle errors explicitly and return or raise an accurate failure state. The reported condition is that a developer needs to accumulate invoice amounts but stores intermediate numeric values as formatted text; the more direct action is to totals remain mathematically correct across decimal precision and locale settings.

D:

“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: a developer needs to accumulate invoice amounts but stores intermediate numeric values as formatted text. This case instead calls for “Totals remain mathematically correct across decimal precision and locale settings”.

Question 16

At fictional Yorkshire Housing, the Business Central development team is supporting property service charges and reviewing AL business logic and user experience during an integration contract review (MB820-4.3-153). The observed development issue is that a developer needs to accumulate invoice amounts but stores intermediate numeric values as formatted text. Which recurring engineering check would best prevent this issue from returning?

  1. Test negative paths and asserted error messages.
  2. Review externally visible procedures in every release.
  3. Test calculations under multiple client cultures.
  4. Run tests for empty, single-row and multirow selections.

Explanation

Correct Answer

C:

The ongoing check is to test calculations under multiple client cultures. This helps detect recurrence when a developer needs to accumulate invoice amounts but stores intermediate numeric values as formatted text. The associated correction is to use a suitable Decimal variable and numeric expressions, formatting only at display boundaries; a confirming result is that totals remain mathematically correct across decimal precision and locale settings.

Incorrect Answers

A:

“Test negative paths and asserted error messages” concerns the alternative task “handle errors explicitly and return or raise an accurate failure state”, but the stated failure is that a developer needs to accumulate invoice amounts but stores intermediate numeric values as formatted text. The required measure is to test calculations under multiple client cultures.

B:

The proposed “Review externally visible procedures in every release” tests a different control: use local/internal/protected access boundaries as appropriate to the AL object and intended consumers. The reported condition is that a developer needs to accumulate invoice amounts but stores intermediate numeric values as formatted text; the more direct action is to test calculations under multiple client cultures.

D:

“Run tests for empty, single-row and multirow selections” concerns the separate step “use a correct AL iteration pattern with repeat/until and Next() or suitable FindSet traversal”. The reported issue is that a developer needs to accumulate invoice amounts but stores intermediate numeric values as formatted text, so the direct response is to test calculations under multiple client cultures.

Question 17

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 Business Central or AL development principle best explains the right response?

  1. Shared business records need concurrency-aware mutation logic.
  2. Typed inputs and validated procedures protect data integrity.
  3. Direct field assignment and field validation are not interchangeable operations.
  4. Record API success conditions must be handled explicitly.

Explanation

Correct Answer

D:

The governing principle is that record API success conditions must be handled explicitly. The engineering response is to check the Boolean result of the record lookup and handle not-found cases deliberately. Verification should show that a missing record yields a defined outcome instead of an unexpected runtime error.

Incorrect Answers

A:

The proposed “Shared business records need concurrency-aware mutation logic” tests a different control: use a controlled concurrency/locking strategy and validate expected record state before updating. 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 check the Boolean result of the record lookup and handle not-found cases deliberately.

B:

“Typed inputs and validated procedures protect data integrity” 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 “check the Boolean result of the record lookup and handle not-found cases deliberately”.

C:

“Direct field assignment and field validation are not interchangeable operations” concerns the separate step “use appropriate Validate calls or supported update APIs before committing the record change”. The reported issue is that an extension assumes FindFirst will always find a matching ledger row and crashes when the set is empty, so the direct response is to check the Boolean result of the record lookup and handle not-found cases deliberately.

Question 18

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 recurring engineering check would best prevent this issue from returning?

  1. Test negative paths and asserted error messages.
  2. Test empty and populated record sets.
  3. Test filter behavior with similarly named fields.
  4. Review externally visible procedures in every release.

Explanation

Correct Answer

B:

The ongoing check is to test empty and populated record sets. This helps detect recurrence when an extension assumes FindFirst will always find a matching ledger row and crashes when the set is empty. The associated correction is to check the Boolean result of the record lookup and handle not-found cases deliberately; a confirming result is that a missing record yields a defined outcome instead of an unexpected runtime error.

Incorrect Answers

A:

“Test negative paths and asserted error messages” supports the separate task “handle errors explicitly and return or raise an accurate failure state”, 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 “Test empty and populated record sets”.

C:

“Test filter behavior with similarly named fields” 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 test empty and populated record sets.

D:

The proposed “Review externally visible procedures in every release” tests a different control: use local/internal/protected access boundaries as appropriate to the AL object and intended consumers. 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 test empty and populated record sets.

Question 19

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 AL development or design response most directly addresses this issue?

  1. Check the Boolean result of the record lookup and handle not-found cases deliberately.
  2. Use a controlled concurrency/locking strategy and validate expected record state before updating.
  3. Use local/internal/protected access boundaries as appropriate to the AL object and intended consumers.
  4. Use appropriate Validate calls or supported update APIs before committing the record change.

Explanation

Correct Answer

A:

The most direct corrective response is to check the Boolean result of the record lookup and handle not-found cases deliberately. This addresses the specific failure where an extension assumes FindFirst will always find a matching ledger row and crashes when the set is empty. Acceptance evidence is that a missing record yields a defined outcome instead of an unexpected runtime error.

Incorrect Answers

B:

“Use a controlled concurrency/locking strategy and validate expected record state before updating” concerns the alternative task “use a controlled concurrency/locking strategy and validate expected record state before updating”, 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 check the Boolean result of the record lookup and handle not-found cases deliberately.

C:

The proposed “Use local/internal/protected access boundaries as appropriate to the AL object and intended consumers” tests a different control: use local/internal/protected access boundaries as appropriate to the AL object and intended consumers. 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 check the Boolean result of the record lookup and handle not-found cases deliberately.

D:

“Use appropriate Validate calls or supported update APIs before committing the record change” supports the separate task “use appropriate Validate calls or supported update APIs before committing the record change”, 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 “check the Boolean result of the record lookup and handle not-found cases deliberately”.

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”.