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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 34

Question 330

At fictional Harborline Health Supply, the Business Central development team is supporting medical supply purchasing and reviewing object model and application extensibility during a tenant acceptance test (MB820-3.1-060). The observed development issue is that a team tries to add a new invoice state by changing a standard option field with closed choices. Which Business Central or AL development principle best explains the right response?

  1. Extensible enums permit declared values across compatible app boundaries.
  2. Data schema extensions must account for previously stored records.
  3. Page extensions enhance specific UI surfaces and must consider visibility controls.
  4. Calculated fields derive values from data rather than storing independent copies.

Explanation

Correct Answer

A:

The governing principle is that extensible enums permit declared values across compatible app boundaries. The engineering response is to use a supported extensible enum or enumextension where the target model allows extension. Verification should show that the new enum value is recognized without modifying the base object's existing members.

Incorrect Answers

B:

“Data schema extensions must account for previously stored records” concerns the separate step “use a compatible field design and controlled initialization that respects existing rows”. The reported issue is that a team tries to add a new invoice state by changing a standard option field with closed choices, so the direct response is to use a supported extensible enum or enumextension where the target model allows extension.

C:

“Page extensions enhance specific UI surfaces and must consider visibility controls” concerns the alternative task “add the field in the appropriate pageextension layout section and verify ApplicationArea and permissions”, but the stated failure is that a team tries to add a new invoice state by changing a standard option field with closed choices. The required measure is to use a supported extensible enum or enumextension where the target model allows extension.

D:

The proposed “Calculated fields derive values from data rather than storing independent copies” tests a different control: define an appropriate FlowField with a CalcFormula and use CalcFields where required. The reported condition is that a team tries to add a new invoice state by changing a standard option field with closed choices; the more direct action is to use a supported extensible enum or enumextension where the target model allows extension.

Question 331

At fictional Harborline Health Supply, the Business Central development team is supporting medical supply purchasing and reviewing object model and application extensibility during a tenant acceptance test (MB820-3.1-060). The observed development issue is that a team tries to add a new invoice state by changing a standard option field with closed choices. Which observed result would most clearly show the intended correction works?

  1. The selected user role opens a workspace with approved cues and navigation.
  2. The new enum value is recognized without modifying the base object's existing members.
  3. New records accept controlled category values without arbitrary unsupported strings.
  4. The approved role sees the field in the expected group without replacing the base page.

Explanation

Correct Answer

B:

This is the outcome that directly verifies the intended correction: the new enum value is recognized without modifying the base object's existing members. The related solution is to use a supported extensible enum or enumextension where the target model allows extension; it is based on the principle that extensible enums permit declared values across compatible app boundaries.

Incorrect Answers

A:

“The selected user role opens a workspace with approved cues and navigation” concerns the separate step “implement or extend an appropriate Role Center page/profile with relevant activities and actions”. The reported issue is that a team tries to add a new invoice state by changing a standard option field with closed choices, so the direct response is to the new enum value is recognized without modifying the base object's existing members.

C:

The proposed “New records accept controlled category values without arbitrary unsupported strings” tests a different control: model categories with a supported enum or related lookup table appropriate to extensibility requirements. The reported condition is that a team tries to add a new invoice state by changing a standard option field with closed choices; the more direct action is to the new enum value is recognized without modifying the base object's existing members.

D:

“The approved role sees the field in the expected group without replacing the base page” supports the separate task “add the field in the appropriate pageextension layout section and verify ApplicationArea and permissions”, not the reported problem: a team tries to add a new invoice state by changing a standard option field with closed choices. This case instead calls for “The new enum value is recognized without modifying the base object's existing members”.

Question 332

At fictional Harborline Health Supply, the Business Central development team is supporting medical supply purchasing and reviewing object model and application extensibility during a tenant acceptance test (MB820-3.1-060). The observed development issue is that a team tries to add a new invoice state by changing a standard option field with closed choices. Which AL development or design response most directly addresses this issue?

  1. Implement or extend an appropriate Role Center page/profile with relevant activities and actions.
  2. Define an appropriate FlowField with a CalcFormula and use CalcFields where required.
  3. Use a supported extensible enum or enumextension where the target model allows extension.
  4. Set appropriate DataClassification properties on table fields and review their privacy meaning.

Explanation

Correct Answer

C:

The most direct corrective response is to use a supported extensible enum or enumextension where the target model allows extension. This addresses the specific failure where a team tries to add a new invoice state by changing a standard option field with closed choices. Acceptance evidence is that the new enum value is recognized without modifying the base object's existing members.

Incorrect Answers

A:

“Implement or extend an appropriate Role Center page/profile with relevant activities and actions” concerns the alternative task “implement or extend an appropriate Role Center page/profile with relevant activities and actions”, but the stated failure is that a team tries to add a new invoice state by changing a standard option field with closed choices. The required measure is to use a supported extensible enum or enumextension where the target model allows extension.

B:

The proposed “Define an appropriate FlowField with a CalcFormula and use CalcFields where required” tests a different control: define an appropriate FlowField with a CalcFormula and use CalcFields where required. The reported condition is that a team tries to add a new invoice state by changing a standard option field with closed choices; the more direct action is to use a supported extensible enum or enumextension where the target model allows extension.

D:

“Set appropriate DataClassification properties on table fields and review their privacy meaning” concerns the separate step “set appropriate DataClassification properties on table fields and review their privacy meaning”. The reported issue is that a team tries to add a new invoice state by changing a standard option field with closed choices, so the direct response is to use a supported extensible enum or enumextension where the target model allows extension.

Question 333

At fictional Lakeshore Energy, the Business Central development team is supporting asset maintenance procurement and reviewing solution architecture design during a localization review (MB820-1.2-019). The observed development issue is that a support team assumes disabling an extension automatically deletes its database data. Which recurring engineering check would best prevent this issue from returning?

  1. Compare exported API surfaces at every version promotion.
  2. Require owner approval for destructive extension cleanup.
  3. Run marketplace-specific checks in CI before submitting a release.
  4. Check ID conflicts against declared installed dependencies.

Explanation

Correct Answer

B:

The ongoing check is to require owner approval for destructive extension cleanup. This helps detect recurrence when a support team assumes disabling an extension automatically deletes its database data. The associated correction is to document supported uninstall and delete-data behavior, preserve data as required and use deliberate cleanup procedures; a confirming result is that after an app lifecycle test, retained data and removal actions match the documented policy.

Incorrect Answers

A:

The proposed “Compare exported API surfaces at every version promotion” tests a different control: version public interfaces compatibly and review downstream dependency contracts before a breaking change. The reported condition is that a support team assumes disabling an extension automatically deletes its database data; the more direct action is to require owner approval for destructive extension cleanup.

C:

“Run marketplace-specific checks in CI before submitting a release” concerns the separate step “run the appropriate AppSourceCop and code analysis gates against the target runtime”. The reported issue is that a support team assumes disabling an extension automatically deletes its database data, so the direct response is to require owner approval for destructive extension cleanup.

D:

“Check ID conflicts against declared installed dependencies” concerns the alternative task “allocate supported object ID ranges and check unique app identity and object conflicts”, but the stated failure is that a support team assumes disabling an extension automatically deletes its database data. The required measure is to require owner approval for destructive extension cleanup.

Question 334

At fictional Lakeshore Energy, the Business Central development team is supporting asset maintenance procurement and reviewing solution architecture design during a localization review (MB820-1.2-019). The observed development issue is that a support team assumes disabling an extension automatically deletes its database data. Which observed result would most clearly show the intended correction works?

  1. The extension passes compatibility tests while the base application remains independently updatable.
  2. The same app displays approved captions under both configured client languages.
  3. Shared workflows run with both apps installed and no conflicting state transitions.
  4. After an app lifecycle test, retained data and removal actions match the documented policy.

Explanation

Correct Answer

D:

This is the outcome that directly verifies the intended correction: after an app lifecycle test, retained data and removal actions match the documented policy. The related solution is to document supported uninstall and delete-data behavior, preserve data as required and use deliberate cleanup procedures; it is based on the principle that an extension's activation state is distinct from irreversible data deletion.

Incorrect Answers

A:

“The extension passes compatibility tests while the base application remains independently updatable” supports the separate task “implement published tables, page extensions and event subscribers rather than distributing a modified base application”, not the reported problem: a support team assumes disabling an extension automatically deletes its database data. This case instead calls for “After an app lifecycle test, retained data and removal actions match the documented policy”.

B:

“The same app displays approved captions under both configured client languages” concerns the separate step “add language translation files and validate translatable properties for the supported locales”. The reported issue is that a support team assumes disabling an extension automatically deletes its database data, so the direct response is to after an app lifecycle test, retained data and removal actions match the documented policy.

C:

“Shared workflows run with both apps installed and no conflicting state transitions” concerns the alternative task “use documented extension points and define integration precedence, supported events and compatibility tests”, but the stated failure is that a support team assumes disabling an extension automatically deletes its database data. The required measure is to after an app lifecycle test, retained data and removal actions match the documented policy.

Question 335

At fictional Lakeshore Energy, the Business Central development team is supporting asset maintenance procurement and reviewing solution architecture design during a localization review (MB820-1.2-019). The observed development issue is that a support team assumes disabling an extension automatically deletes its database data. Which AL development or design response most directly addresses this issue?

  1. Add language translation files and validate translatable properties for the supported locales.
  2. Document supported uninstall and delete-data behavior, preserve data as required and use deliberate cleanup procedures.
  3. Version public interfaces compatibly and review downstream dependency contracts before a breaking change.
  4. Select a per-tenant deployment for tenant-specific use and an AppSource publishing workflow for marketplace distribution.

Explanation

Correct Answer

B:

The most direct corrective response is to document supported uninstall and delete-data behavior, preserve data as required and use deliberate cleanup procedures. This addresses the specific failure where a support team assumes disabling an extension automatically deletes its database data. Acceptance evidence is that after an app lifecycle test, retained data and removal actions match the documented policy.

Incorrect Answers

A:

“Add language translation files and validate translatable properties for the supported locales” concerns the separate step “add language translation files and validate translatable properties for the supported locales”. The reported issue is that a support team assumes disabling an extension automatically deletes its database data, so the direct response is to document supported uninstall and delete-data behavior, preserve data as required and use deliberate cleanup procedures.

C:

The proposed “Version public interfaces compatibly and review downstream dependency contracts before a breaking change” tests a different control: version public interfaces compatibly and review downstream dependency contracts before a breaking change. The reported condition is that a support team assumes disabling an extension automatically deletes its database data; the more direct action is to document supported uninstall and delete-data behavior, preserve data as required and use deliberate cleanup procedures.

D:

“Select a per-tenant deployment for tenant-specific use and an AppSource publishing workflow for marketplace distribution” supports the separate task “select a per-tenant deployment for tenant-specific use and an AppSource publishing workflow for marketplace distribution”, not the reported problem: a support team assumes disabling an extension automatically deletes its database data. This case instead calls for “document supported uninstall and delete-data behavior, preserve data as required and use deliberate cleanup procedures”.

Question 336

At fictional Lakeshore Energy, the Business Central development team is supporting asset maintenance procurement and reviewing solution architecture design during a localization review (MB820-1.2-019). The observed development issue is that a support team assumes disabling an extension automatically deletes its database data. Which Business Central or AL development principle best explains the right response?

  1. Business Central extension dependencies are explicit contracts.
  2. App identity and object namespace allocation are distinct packaging concerns.
  3. Compiler success alone is not marketplace certification.
  4. An extension's activation state is distinct from irreversible data deletion.

Explanation

Correct Answer

D:

The governing principle is that an extension's activation state is distinct from irreversible data deletion. The engineering response is to document supported uninstall and delete-data behavior, preserve data as required and use deliberate cleanup procedures. Verification should show that after an app lifecycle test, retained data and removal actions match the documented policy.

Incorrect Answers

A:

“Business Central extension dependencies are explicit contracts” concerns the alternative task “declare the exact dependency identifier and compatible version constraints in the manifest”, but the stated failure is that a support team assumes disabling an extension automatically deletes its database data. The required measure is to document supported uninstall and delete-data behavior, preserve data as required and use deliberate cleanup procedures.

B:

The proposed “App identity and object namespace allocation are distinct packaging concerns” tests a different control: allocate supported object ID ranges and check unique app identity and object conflicts. The reported condition is that a support team assumes disabling an extension automatically deletes its database data; the more direct action is to document supported uninstall and delete-data behavior, preserve data as required and use deliberate cleanup procedures.

C:

“Compiler success alone is not marketplace certification” supports the separate task “run the appropriate AppSourceCop and code analysis gates against the target runtime”, not the reported problem: a support team assumes disabling an extension automatically deletes its database data. This case instead calls for “document supported uninstall and delete-data behavior, preserve data as required and use deliberate cleanup procedures”.

Question 337

At fictional Riverside Consulting, the Business Central development team is supporting professional project billing and reviewing automated testing and diagnostics during an AL developer handoff (MB820-5.1-162). The observed development issue is that an app upgrade contains a data migration but regression tests only cover fresh installs. Which AL development or design response most directly addresses this issue?

  1. Assert expected dataset values or generated output with representative fixtures.
  2. Use controlled HTTP mocks or supported test isolation and fixture responses.
  3. Seed an older app version with representative data then test upgrade preservation.
  4. Create AL test codeunits with [Test] procedures covering success and rejection branches.

Explanation

Correct Answer

C:

The most direct corrective response is to seed an older app version with representative data then test upgrade preservation. This addresses the specific failure where an app upgrade contains a data migration but regression tests only cover fresh installs. Acceptance evidence is that historical records remain correct across the version change.

Incorrect Answers

A:

The proposed “Assert expected dataset values or generated output with representative fixtures” tests a different control: assert expected dataset values or generated output with representative fixtures. The reported condition is that an app upgrade contains a data migration but regression tests only cover fresh installs; the more direct action is to seed an older app version with representative data then test upgrade preservation.

B:

“Use controlled HTTP mocks or supported test isolation and fixture responses” supports the separate task “use controlled HTTP mocks or supported test isolation and fixture responses”, not the reported problem: an app upgrade contains a data migration but regression tests only cover fresh installs. This case instead calls for “seed an older app version with representative data then test upgrade preservation”.

D:

“Create AL test codeunits with [Test] procedures covering success and rejection branches” concerns the alternative task “create AL test codeunits with [Test] procedures covering success and rejection branches”, but the stated failure is that an app upgrade contains a data migration but regression tests only cover fresh installs. The required measure is to seed an older app version with representative data then test upgrade preservation.

Question 338

At fictional Riverside Consulting, the Business Central development team is supporting professional project billing and reviewing automated testing and diagnostics during an AL developer handoff (MB820-5.1-162). The observed development issue is that an app upgrade contains a data migration but regression tests only cover fresh installs. Which observed result would most clearly show the intended correction works?

  1. Historical records remain correct across the version change.
  2. The build is blocked when an AL test codeunit fails.
  3. Tests produce consistent results when executed alone or in different orders.
  4. The automated suite catches both allowed and blocked transaction outcomes.

Explanation

Correct Answer

A:

This is the outcome that directly verifies the intended correction: historical records remain correct across the version change. The related solution is to seed an older app version with representative data then test upgrade preservation; it is based on the principle that upgrade testing differs from clean-install testing.

Incorrect Answers

B:

“The build is blocked when an AL test codeunit fails” concerns the separate step “configure and execute supported Business Central tests in the Test Toolkit or automated test runner”. The reported issue is that an app upgrade contains a data migration but regression tests only cover fresh installs, so the direct response is to historical records remain correct across the version change.

C:

“Tests produce consistent results when executed alone or in different orders” concerns the alternative task “create independent fixtures for each test and use appropriate cleanup or transaction isolation”, but the stated failure is that an app upgrade contains a data migration but regression tests only cover fresh installs. The required measure is to historical records remain correct across the version change.

D:

The proposed “The automated suite catches both allowed and blocked transaction outcomes” tests a different control: create AL test codeunits with [Test] procedures covering success and rejection branches. The reported condition is that an app upgrade contains a data migration but regression tests only cover fresh installs; the more direct action is to historical records remain correct across the version change.

Question 339

At fictional Riverside Consulting, the Business Central development team is supporting professional project billing and reviewing automated testing and diagnostics during an AL developer handoff (MB820-5.1-162). The observed development issue is that an app upgrade contains a data migration but regression tests only cover fresh installs. Which recurring engineering check would best prevent this issue from returning?

  1. Require tests for every new posting rule.
  2. Audit outbound test endpoints and credentials.
  3. Run report regression checks after dataset changes.
  4. Add seeded data migration cases to release gates.

Explanation

Correct Answer

D:

The ongoing check is to add seeded data migration cases to release gates. This helps detect recurrence when an app upgrade contains a data migration but regression tests only cover fresh installs. The associated correction is to seed an older app version with representative data then test upgrade preservation; a confirming result is that historical records remain correct across the version change.

Incorrect Answers

A:

“Require tests for every new posting rule” concerns the separate step “create AL test codeunits with [Test] procedures covering success and rejection branches”. The reported issue is that an app upgrade contains a data migration but regression tests only cover fresh installs, so the direct response is to add seeded data migration cases to release gates.

B:

“Audit outbound test endpoints and credentials” concerns the alternative task “use controlled HTTP mocks or supported test isolation and fixture responses”, but the stated failure is that an app upgrade contains a data migration but regression tests only cover fresh installs. The required measure is to add seeded data migration cases to release gates.

C:

The proposed “Run report regression checks after dataset changes” tests a different control: assert expected dataset values or generated output with representative fixtures. The reported condition is that an app upgrade contains a data migration but regression tests only cover fresh installs; the more direct action is to add seeded data migration cases to release gates.

Question 340

At fictional Riverside Consulting, the Business Central development team is supporting professional project billing and reviewing automated testing and diagnostics during an AL developer handoff (MB820-5.1-162). The observed development issue is that an app upgrade contains a data migration but regression tests only cover fresh installs. Which Business Central or AL development principle best explains the right response?

  1. Testing infrastructure is valuable only when it gates delivery.
  2. Regression testing needs executable assertions, not only manual exploration.
  3. Report tests should verify content, not merely execution.
  4. Upgrade testing differs from clean-install testing.

Explanation

Correct Answer

D:

The governing principle is that upgrade testing differs from clean-install testing. The engineering response is to seed an older app version with representative data then test upgrade preservation. Verification should show that historical records remain correct across the version change.

Incorrect Answers

A:

“Testing infrastructure is valuable only when it gates delivery” concerns the alternative task “configure and execute supported Business Central tests in the Test Toolkit or automated test runner”, but the stated failure is that an app upgrade contains a data migration but regression tests only cover fresh installs. The required measure is to seed an older app version with representative data then test upgrade preservation.

B:

The proposed “Regression testing needs executable assertions, not only manual exploration” tests a different control: create AL test codeunits with [Test] procedures covering success and rejection branches. The reported condition is that an app upgrade contains a data migration but regression tests only cover fresh installs; the more direct action is to seed an older app version with representative data then test upgrade preservation.

C:

“Report tests should verify content, not merely execution” supports the separate task “assert expected dataset values or generated output with representative fixtures”, not the reported problem: an app upgrade contains a data migration but regression tests only cover fresh installs. This case instead calls for “seed an older app version with representative data then test upgrade preservation”.