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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 23

Question 220

At fictional Granite Telecom, the Business Central development team is supporting field equipment billing and reviewing external-service integration during a tenant acceptance test (MB820-6.2-191). The observed development issue is that a SaaS integration makes destructive data changes through an OData endpoint with no caller authorization review. Which recurring engineering check would best prevent this issue from returning?

  1. Audit API field lists and permission behavior after schema changes.
  2. Diff published schemas before deployment.
  3. Test data freshness and consistency assumptions before enabling read scale-out.
  4. Run negative authorization tests against API endpoints.

Explanation

Correct Answer

D:

The ongoing check is to run negative authorization tests against API endpoints. This helps detect recurrence when a SaaS integration makes destructive data changes through an OData endpoint with no caller authorization review. The associated correction is to expose only approved actions and enforce permissions and validation at the service boundary; a confirming result is that unauthorized requests are denied even when callers know the endpoint URL.

Incorrect Answers

A:

“Audit API field lists and permission behavior after schema changes” concerns the alternative task “expose only the minimal approved fields and apply entitlement and permission rules”, but the stated failure is that a SaaS integration makes destructive data changes through an OData endpoint with no caller authorization review. The required measure is to run negative authorization tests against API endpoints.

B:

The proposed “Diff published schemas before deployment” tests a different control: preserve compatible contracts or introduce a deliberate versioned API and migration path. The reported condition is that a SaaS integration makes destructive data changes through an OData endpoint with no caller authorization review; the more direct action is to run negative authorization tests against API endpoints.

C:

“Test data freshness and consistency assumptions before enabling read scale-out” supports the separate task “evaluate supported read scale-out patterns for appropriate read workloads without compromising consistency needs”, not the reported problem: a SaaS integration makes destructive data changes through an OData endpoint with no caller authorization review. This case instead calls for “Run negative authorization tests against API endpoints”.

Question 221

At fictional Fairview Commerce, the Business Central development team is supporting online sales processing and reviewing object model and application extensibility during a sandbox design review (MB820-3.4-095). The observed development issue is that a legacy procedure contains duplicated tax calculation logic copied into five page extensions. Which recurring engineering check would best prevent this issue from returning?

  1. Review public procedures for unintended side effects.
  2. Review deprecated or changed events during upgrades.
  3. Add regression cases for alternate event paths.
  4. Use unit tests to detect divergent calculation paths.

Explanation

Correct Answer

D:

The ongoing check is to use unit tests to detect divergent calculation paths. This helps detect recurrence when a legacy procedure contains duplicated tax calculation logic copied into five page extensions. The associated correction is to move reusable logic to an appropriate codeunit and call it through a stable interface; a confirming result is that all five callers return consistent results from one tested implementation.

Incorrect Answers

A:

The proposed “Review public procedures for unintended side effects” tests a different control: refactor it to accept explicit inputs and return a well-defined result without hidden mutable dependencies. The reported condition is that a legacy procedure contains duplicated tax calculation logic copied into five page extensions; the more direct action is to use unit tests to detect divergent calculation paths.

B:

“Review deprecated or changed events during upgrades” supports the separate task “use available integration events and a subscriber or suitable extension point”, not the reported problem: a legacy procedure contains duplicated tax calculation logic copied into five page extensions. This case instead calls for “Use unit tests to detect divergent calculation paths”.

C:

“Add regression cases for alternate event paths” concerns the separate step “inspect the event signature and handle missing or incomplete values according to contract”. The reported issue is that a legacy procedure contains duplicated tax calculation logic copied into five page extensions, so the direct response is to use unit tests to detect divergent calculation paths.

Question 222

At fictional Fairview Commerce, the Business Central development team is supporting online sales processing and reviewing object model and application extensibility during a sandbox design review (MB820-3.4-095). The observed development issue is that a legacy procedure contains duplicated tax calculation logic copied into five page extensions. Which Business Central or AL development principle best explains the right response?

  1. Codeunits encapsulate reusable AL behavior.
  2. Business events decouple cross-cutting logic from one screen.
  3. Field validation triggers depend on the AL operation used.
  4. Interfaces separate caller expectations from interchangeable implementations.

Explanation

Correct Answer

A:

The governing principle is that codeunits encapsulate reusable AL behavior. The engineering response is to move reusable logic to an appropriate codeunit and call it through a stable interface. Verification should show that all five callers return consistent results from one tested implementation.

Incorrect Answers

B:

“Business events decouple cross-cutting logic from one screen” concerns the separate step “subscribe to an appropriate published business event or design a reusable codeunit validation at the relevant process boundary”. The reported issue is that a legacy procedure contains duplicated tax calculation logic copied into five page extensions, so the direct response is to move reusable logic to an appropriate codeunit and call it through a stable interface.

C:

“Field validation triggers depend on the AL operation used” concerns the alternative task “call the appropriate validation mechanism when business rules must run during programmatic updates”, but the stated failure is that a legacy procedure contains duplicated tax calculation logic copied into five page extensions. The required measure is to move reusable logic to an appropriate codeunit and call it through a stable interface.

D:

The proposed “Interfaces separate caller expectations from interchangeable implementations” tests a different control: define an AL interface and implement it in separate codeunits with a supported dispatch pattern. The reported condition is that a legacy procedure contains duplicated tax calculation logic copied into five page extensions; the more direct action is to move reusable logic to an appropriate codeunit and call it through a stable interface.

Question 223

At fictional Fairview Commerce, the Business Central development team is supporting online sales processing and reviewing object model and application extensibility during a sandbox design review (MB820-3.4-095). The observed development issue is that a legacy procedure contains duplicated tax calculation logic copied into five page extensions. Which AL development or design response most directly addresses this issue?

  1. Refactor it to accept explicit inputs and return a well-defined result without hidden mutable dependencies.
  2. Move reusable logic to an appropriate codeunit and call it through a stable interface.
  3. Preserve error meaning and stop or compensate the transaction rather than falsely reporting success.
  4. Subscribe to an appropriate published business event or design a reusable codeunit validation at the relevant process boundary.

Explanation

Correct Answer

B:

The most direct corrective response is to move reusable logic to an appropriate codeunit and call it through a stable interface. This addresses the specific failure where a legacy procedure contains duplicated tax calculation logic copied into five page extensions. Acceptance evidence is that all five callers return consistent results from one tested implementation.

Incorrect Answers

A:

“Refactor it to accept explicit inputs and return a well-defined result without hidden mutable dependencies” 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 legacy procedure contains duplicated tax calculation logic copied into five page extensions, so the direct response is to move reusable logic to an appropriate codeunit and call it through a stable interface.

C:

The proposed “Preserve error meaning and stop or compensate the transaction rather than falsely reporting success” tests a different control: preserve error meaning and stop or compensate the transaction rather than falsely reporting success. The reported condition is that a legacy procedure contains duplicated tax calculation logic copied into five page extensions; the more direct action is to move reusable logic to an appropriate codeunit and call it through a stable interface.

D:

“Subscribe to an appropriate published business event or design a reusable codeunit validation at the relevant process boundary” supports the separate task “subscribe to an appropriate published business event or design a reusable codeunit validation at the relevant process boundary”, not the reported problem: a legacy procedure contains duplicated tax calculation logic copied into five page extensions. This case instead calls for “move reusable logic to an appropriate codeunit and call it through a stable interface”.

Question 224

At fictional Fairview Commerce, the Business Central development team is supporting online sales processing and reviewing object model and application extensibility during a sandbox design review (MB820-3.4-095). The observed development issue is that a legacy procedure contains duplicated tax calculation logic copied into five page extensions. Which observed result would most clearly show the intended correction works?

  1. Fresh installations and upgrades apply only their intended initialization or migration actions.
  2. All five callers return consistent results from one tested implementation.
  3. Both implementations satisfy the same contract and can be chosen without caller source rewrites.
  4. Data updates via the intended code path apply field validation consistently.

Explanation

Correct Answer

B:

This is the outcome that directly verifies the intended correction: all five callers return consistent results from one tested implementation. The related solution is to move reusable logic to an appropriate codeunit and call it through a stable interface; it is based on the principle that codeunits encapsulate reusable AL behavior.

Incorrect Answers

A:

“Fresh installations and upgrades apply only their intended initialization or migration actions” concerns the alternative task “use distinct Install and Upgrade codeunits, implementing the appropriate lifecycle triggers”, but the stated failure is that a legacy procedure contains duplicated tax calculation logic copied into five page extensions. The required measure is to all five callers return consistent results from one tested implementation.

C:

“Both implementations satisfy the same contract and can be chosen without caller source rewrites” supports the separate task “define an AL interface and implement it in separate codeunits with a supported dispatch pattern”, not the reported problem: a legacy procedure contains duplicated tax calculation logic copied into five page extensions. This case instead calls for “All five callers return consistent results from one tested implementation”.

D:

“Data updates via the intended code path apply field validation consistently” concerns the separate step “call the appropriate validation mechanism when business rules must run during programmatic updates”. The reported issue is that a legacy procedure contains duplicated tax calculation logic copied into five page extensions, so the direct response is to all five callers return consistent results from one tested implementation.

Question 225

At fictional Trinity Trading, the Business Central development team is supporting cross-border purchasing and reviewing extension environment and deployment preparation during an AL developer handoff (MB820-2.2-043). The observed development issue is that a release pipeline deploys a package without checking published permissions and install status. Which observed result would most clearly show the intended correction works?

  1. The production package hash matches the artifact that passed tests.
  2. The extension installs after prerequisites are present and the dependency graph resolves.
  3. The app remains installed or is removed only by an explicit supported lifecycle action.
  4. A failed installation is detected before the release is marked successful.

Explanation

Correct Answer

D:

This is the outcome that directly verifies the intended correction: a failed installation is detected before the release is marked successful. The related solution is to separate publish, synchronize, install or upgrade and validation stages with explicit failure reporting; it is based on the principle that deployment comprises several independently verifiable lifecycle operations.

Incorrect Answers

A:

The proposed “The production package hash matches the artifact that passed tests” tests a different control: promote a versioned extension artifact through sandbox acceptance before production deployment. The reported condition is that a release pipeline deploys a package without checking published permissions and install status; the more direct action is to a failed installation is detected before the release is marked successful.

B:

“The extension installs after prerequisites are present and the dependency graph resolves” supports the separate task “publish and install compatible dependencies before the dependent .app file”, not the reported problem: a release pipeline deploys a package without checking published permissions and install status. This case instead calls for “A failed installation is detected before the release is marked successful”.

C:

“The app remains installed or is removed only by an explicit supported lifecycle action” concerns the separate step “separate debugger lifecycle from extension publish, install and uninstall procedures”. The reported issue is that a release pipeline deploys a package without checking published permissions and install status, so the direct response is to a failed installation is detected before the release is marked successful.

Question 226

At fictional Trinity Trading, the Business Central development team is supporting cross-border purchasing and reviewing extension environment and deployment preparation during an AL developer handoff (MB820-2.2-043). The observed development issue is that a release pipeline deploys a package without checking published permissions and install status. Which recurring engineering check would best prevent this issue from returning?

  1. Gate completion on installed version and smoke-test results.
  2. Run multilingual UI checks after adding new messages.
  3. Include reproducible debug profiles in developer handoffs.
  4. Record deployed app versions before and after debug sessions.

Explanation

Correct Answer

A:

The ongoing check is to gate completion on installed version and smoke-test results. This helps detect recurrence when a release pipeline deploys a package without checking published permissions and install status. The associated correction is to separate publish, synchronize, install or upgrade and validation stages with explicit failure reporting; a confirming result is that a failed installation is detected before the release is marked successful.

Incorrect Answers

B:

“Run multilingual UI checks after adding new messages” concerns the separate step “use AL labels and language translation resources rather than embedding UI messages as literals”. The reported issue is that a release pipeline deploys a package without checking published permissions and install status, so the direct response is to gate completion on installed version and smoke-test results.

C:

“Include reproducible debug profiles in developer handoffs” concerns the alternative task “use supported VS Code AL launch or attach debugging with a matching sandbox and symbols”, but the stated failure is that a release pipeline deploys a package without checking published permissions and install status. The required measure is to gate completion on installed version and smoke-test results.

D:

The proposed “Record deployed app versions before and after debug sessions” tests a different control: separate debugger lifecycle from extension publish, install and uninstall procedures. The reported condition is that a release pipeline deploys a package without checking published permissions and install status; the more direct action is to gate completion on installed version and smoke-test results.

Question 227

At fictional Trinity Trading, the Business Central development team is supporting cross-border purchasing and reviewing extension environment and deployment preparation during an AL developer handoff (MB820-2.2-043). The observed development issue is that a release pipeline deploys a package without checking published permissions and install status. Which Business Central or AL development principle best explains the right response?

  1. Debugging does not constitute an extension rollback mechanism.
  2. Installation lifecycle hooks differ from ordinary page execution and upgrades.
  3. Versioned app identity is central to the extension lifecycle.
  4. Deployment comprises several independently verifiable lifecycle operations.

Explanation

Correct Answer

D:

The governing principle is that deployment comprises several independently verifiable lifecycle operations. The engineering response is to separate publish, synchronize, install or upgrade and validation stages with explicit failure reporting. Verification should show that a failed installation is detected before the release is marked successful.

Incorrect Answers

A:

“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 a release pipeline deploys a package without checking published permissions and install status, so the direct response is to separate publish, synchronize, install or upgrade and validation stages with explicit failure reporting.

B:

“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 a release pipeline deploys a package without checking published permissions and install status. The required measure is to separate publish, synchronize, install or upgrade and validation stages with explicit failure reporting.

C:

The proposed “Versioned app identity is central to the extension lifecycle” tests a different control: increment the extension version and follow the supported package publish/upgrade path. The reported condition is that a release pipeline deploys a package without checking published permissions and install status; the more direct action is to separate publish, synchronize, install or upgrade and validation stages with explicit failure reporting.

Question 228

At fictional Trinity Trading, the Business Central development team is supporting cross-border purchasing and reviewing extension environment and deployment preparation during an AL developer handoff (MB820-2.2-043). The observed development issue is that a release pipeline deploys a package without checking published permissions and install status. Which AL development or design response most directly addresses this issue?

  1. Separate publish, synchronize, install or upgrade and validation stages with explicit failure reporting.
  2. Use an installation codeunit with appropriate company initialization and idempotent setup.
  3. Use a versioned upgrade codeunit and preserve/migrate existing records before using the new schema.
  4. Use supported VS Code AL launch or attach debugging with a matching sandbox and symbols.

Explanation

Correct Answer

A:

The most direct corrective response is to separate publish, synchronize, install or upgrade and validation stages with explicit failure reporting. This addresses the specific failure where a release pipeline deploys a package without checking published permissions and install status. Acceptance evidence is that a failed installation is detected before the release is marked successful.

Incorrect Answers

B:

The proposed “Use an installation codeunit with appropriate company initialization and idempotent setup” tests a different control: use an installation codeunit with appropriate company initialization and idempotent setup. The reported condition is that a release pipeline deploys a package without checking published permissions and install status; the more direct action is to separate publish, synchronize, install or upgrade and validation stages with explicit failure reporting.

C:

“Use a versioned upgrade codeunit and preserve/migrate existing records before using the new schema” supports the separate task “use a versioned upgrade codeunit and preserve/migrate existing records before using the new schema”, not the reported problem: a release pipeline deploys a package without checking published permissions and install status. This case instead calls for “separate publish, synchronize, install or upgrade and validation stages with explicit failure reporting”.

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 a release pipeline deploys a package without checking published permissions and install status, so the direct response is to separate publish, synchronize, install or upgrade and validation stages with explicit failure reporting.

Question 229

At fictional Quayside Events, the Business Central development team is supporting event vendor payments and reviewing object model and application extensibility during a tenant acceptance test (MB820-3.4-092). The observed development issue is that two independent calculation engines should be selectable by configured policy without hard-coding their implementations. Which observed result would most clearly show the intended correction works?

  1. Both implementations satisfy the same contract and can be chosen without caller source rewrites.
  2. The extension does not crash on supported event variants.
  3. On an injected failure, related changes roll back consistently.
  4. All five callers return consistent results from one tested implementation.

Explanation

Correct Answer

A:

This is the outcome that directly verifies the intended correction: both implementations satisfy the same contract and can be chosen without caller source rewrites. The related solution is to define an AL interface and implement it in separate codeunits with a supported dispatch pattern; it is based on the principle that interfaces separate caller expectations from interchangeable implementations.

Incorrect Answers

B:

“The extension does not crash on supported event variants” supports the separate task “inspect the event signature and handle missing or incomplete values according to contract”, not the reported problem: two independent calculation engines should be selectable by configured policy without hard-coding their implementations. This case instead calls for “Both implementations satisfy the same contract and can be chosen without caller source rewrites”.

C:

“On an injected failure, related changes roll back consistently” concerns the separate step “review transaction boundaries and remove unintended commits from reusable business logic”. The reported issue is that two independent calculation engines should be selectable by configured policy without hard-coding their implementations, so the direct response is to both implementations satisfy the same contract and can be chosen without caller source rewrites.

D:

“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 two independent calculation engines should be selectable by configured policy without hard-coding their implementations. The required measure is to both implementations satisfy the same contract and can be chosen without caller source rewrites.

Question 230

At fictional Quayside Events, the Business Central development team is supporting event vendor payments and reviewing object model and application extensibility during a tenant acceptance test (MB820-3.4-092). The observed development issue is that two independent calculation engines should be selectable by configured policy without hard-coding their implementations. Which Business Central or AL development principle best explains the right response?

  1. Transaction control must respect business process atomicity.
  2. Interfaces separate caller expectations from interchangeable implementations.
  3. Business events decouple cross-cutting logic from one screen.
  4. App installation and data upgrade are different lifecycle events.

Explanation

Correct Answer

B:

The governing principle is that interfaces separate caller expectations from interchangeable implementations. The engineering response is to define an AL interface and implement it in separate codeunits with a supported dispatch pattern. Verification should show that both implementations satisfy the same contract and can be chosen without caller source rewrites.

Incorrect Answers

A:

“Transaction control must respect business process atomicity” supports the separate task “review transaction boundaries and remove unintended commits from reusable business logic”, not the reported problem: two independent calculation engines should be selectable by configured policy without hard-coding their implementations. This case instead calls for “define an AL interface and implement it in separate codeunits with a supported dispatch pattern”.

C:

“Business events decouple cross-cutting logic from one screen” concerns the alternative task “subscribe to an appropriate published business event or design a reusable codeunit validation at the relevant process boundary”, but the stated failure is that two independent calculation engines should be selectable by configured policy without hard-coding their implementations. The required measure is to define an AL interface and implement it in separate codeunits with a supported dispatch pattern.

D:

The proposed “App installation and data upgrade are different lifecycle events” tests a different control: use distinct Install and Upgrade codeunits, implementing the appropriate lifecycle triggers. The reported condition is that two independent calculation engines should be selectable by configured policy without hard-coding their implementations; the more direct action is to define an AL interface and implement it in separate codeunits with a supported dispatch pattern.