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Microsoft MB-820 Premium Bundle

MB-820 Premium File: 131 Questions & Answers

Last Update: Oct 12, 2026

MB-820 PDF Study Guide: 948 Pages

$74.99

MB-820 Bundle gives you unlimited access to "MB-820" files. However, this does not replace the need for a .vce exam simulator. To download your .vce exam simulator click here

Microsoft MB-820 Practice Test 18

Question 170

A warehouse extension is published into a sandbox without executing its post-install setup routine. The developer recommends the following change: Include the appropriate install codeunit and verify its first-install behavior. Which technical explanation most directly justifies it in this case?

  1. Upgrade logic maps existing tenant data to the new schema during an app version transition
  2. Continuous integration should produce the same versioned package from controlled source and dependencies for promotion
  3. The AL debugger exposes call flow and variable state at the problematic trigger or subscriber
  4. Installation logic initializes data and configuration when the extension is installed, independently of subsequent upgrades

Explanation

Correct Answer

D:

Installation logic initializes data and configuration when the extension is installed, independently of subsequent upgrades. It connects the proposed action to the exact failure or requirement—A warehouse extension is published into a sandbox without executing its post-install setup routine. Confirmation would be a fresh test tenant installs the app and receives the expected setup records exactly once.

Incorrect Answers

A:

That mechanism explains why the alternative action—implement an upgrade codeunit and rehearse migration on representative historical records—helps in another case. It does not justify the proposed fix here; installation logic initializes data and configuration when the extension is installed, independently of subsequent upgrades. The distinguishing requirement is: A warehouse extension is published into a sandbox without executing its post-install setup routine.

B:

That mechanism explains why the alternative action—use a reproducible al build and release pipeline with fixed source revision and dependency versions—helps in another case. It does not justify the proposed fix here; installation logic initializes data and configuration when the extension is installed, independently of subsequent upgrades. The distinguishing requirement is: A warehouse extension is published into a sandbox without executing its post-install setup routine.

C:

That mechanism explains why the alternative action—set vs code breakpoints and debug the extension execution path in the sandbox—helps in another case. It does not justify the proposed fix here; installation logic initializes data and configuration when the extension is installed, independently of subsequent upgrades. The distinguishing requirement is: A warehouse extension is published into a sandbox without executing its post-install setup routine.

Question 171

A warehouse extension is published into a sandbox without executing its post-install setup routine. The team implemented a change aligned with this plan: Include the appropriate install codeunit and verify its first-install behavior. Which acceptance result specifically verifies that the reported problem is resolved?

  1. A fresh test tenant installs the app and receives the expected setup records exactly once
  2. An upgraded sandbox retains expected historical records and new lookups work after the migration
  3. Artifact metadata, test results, and release logs all trace to the same approved source commit
  4. A reproducing transaction reaches the breakpoint and the inspected values explain the failing branch

Explanation

Correct Answer

A:

A fresh test tenant installs the app and receives the expected setup records exactly once. This is stronger than an unrelated health check because the desired design action is include the appropriate install codeunit and verify its first-install behavior, and installation logic initializes data and configuration when the extension is installed, independently of subsequent upgrades. The local requirement is: A warehouse extension is published into a sandbox without executing its post-install setup routine.

Incorrect Answers

B:

This would verify implement an upgrade codeunit and rehearse migration on representative historical records, which addresses a different engineering need. It does not demonstrate that the current issue is resolved: A warehouse extension is published into a sandbox without executing its post-install setup routine. The decisive local proof is a fresh test tenant installs the app and receives the expected setup records exactly once.

C:

This would verify use a reproducible al build and release pipeline with fixed source revision and dependency versions, which addresses a different engineering need. It does not demonstrate that the current issue is resolved: A warehouse extension is published into a sandbox without executing its post-install setup routine. The decisive local proof is a fresh test tenant installs the app and receives the expected setup records exactly once.

D:

This would verify set vs code breakpoints and debug the extension execution path in the sandbox, which addresses a different engineering need. It does not demonstrate that the current issue is resolved: A warehouse extension is published into a sandbox without executing its post-install setup routine. The decisive local proof is a fresh test tenant installs the app and receives the expected setup records exactly once.

Question 172

A warehouse extension is published into a sandbox without executing its post-install setup routine. A targeted trial still reproduces the original gap after the team attempted this change: Include the appropriate install codeunit and verify its first-install behavior. Which repair directly addresses the remaining defect?

  1. Fix the upgrade codeunit's data conversion and validate the migration against a restored old-version dataset
  2. Add or correct the install hook and rerun fresh-install tests with clean tenant state
  3. Repair dependency pinning and artifact promotion so the pipeline deploys only its validated build
  4. Point the debugger at the correct environment and executable path, then reproduce and inspect the failing AL call

Explanation

Correct Answer

B:

Add or correct the install hook and rerun fresh-install tests with clean tenant state. This directly addresses the remaining defect for the requirement—A warehouse extension is published into a sandbox without executing its post-install setup routine. It restores the mechanism described here: installation logic initializes data and configuration when the extension is installed, independently of subsequent upgrades.

Incorrect Answers

A:

This correction is for the separate condition: An add-on introduces a revised subscription key and upgrading a populated tenant loses legacy mappings. It would not directly restore the intended behavior in this situation: A warehouse extension is published into a sandbox without executing its post-install setup routine. Here, add or correct the install hook and rerun fresh-install tests with clean tenant state, because installation logic initializes data and configuration when the extension is installed, independently of subsequent upgrades.

C:

This correction is for the separate condition: An extension build generated from one commit works locally but deployment carries an older artifact from another branch. It would not directly restore the intended behavior in this situation: A warehouse extension is published into a sandbox without executing its post-install setup routine. Here, add or correct the install hook and rerun fresh-install tests with clean tenant state, because installation logic initializes data and configuration when the extension is installed, independently of subsequent upgrades.

D:

This correction is for the separate condition: A supplier rebate extension fails only in a particular codeunit path and support needs to inspect live variables safely in a sandbox. It would not directly restore the intended behavior in this situation: A warehouse extension is published into a sandbox without executing its post-install setup routine. Here, add or correct the install hook and rerun fresh-install tests with clean tenant state, because installation logic initializes data and configuration when the extension is installed, independently of subsequent upgrades.

Question 173

A new tenant install requires initial setup records and default feature flags before users start work. Which single AL development or architecture change best resolves this requirement without redesigning unrelated workflows?

  1. Implement an upgrade codeunit and rehearse migration on representative historical records
  2. Use a reproducible AL build and release pipeline with fixed source revision and dependency versions
  3. Set VS Code breakpoints and debug the extension execution path in the sandbox
  4. Include the appropriate install codeunit and verify its first-install behavior

Explanation

Correct Answer

D:

This targets the concrete requirement—A new tenant install requires initial setup records and default feature flags before users start work. Installation logic initializes data and configuration when the extension is installed, independently of subsequent upgrades. The team can establish success when a fresh test tenant installs the app and receives the expected setup records exactly once.

Incorrect Answers

A:

This choice primarily fits a different requirement: A data field changes structure in an extension update while existing invoice records must be migrated. There, upgrade logic maps existing tenant data to the new schema during an app version transition. In the current situation, A new tenant install requires initial setup records and default feature flags before users start work. Installation logic initializes data and configuration when the extension is installed, independently of subsequent upgrades. Acceptance requires a fresh test tenant installs the app and receives the expected setup records exactly once.

B:

This choice primarily fits a different requirement: A package passes interactive deployment but fails after a CI build because the pipeline uses inconsistent dependencies. There, continuous integration should produce the same versioned package from controlled source and dependencies for promotion. In the current situation, A new tenant install requires initial setup records and default feature flags before users start work. Installation logic initializes data and configuration when the extension is installed, independently of subsequent upgrades. Acceptance requires a fresh test tenant installs the app and receives the expected setup records exactly once.

C:

This choice primarily fits a different requirement: An AL developer needs to inspect a record value while a purchase posting subscriber unexpectedly throws an error. There, the al debugger exposes call flow and variable state at the problematic trigger or subscriber. In the current situation, A new tenant install requires initial setup records and default feature flags before users start work. Installation logic initializes data and configuration when the extension is installed, independently of subsequent upgrades. Acceptance requires a fresh test tenant installs the app and receives the expected setup records exactly once.

Question 174

A new tenant install requires initial setup records and default feature flags before users start work. The developer recommends the following change: Include the appropriate install codeunit and verify its first-install behavior. Which technical explanation most directly justifies it in this case?

  1. Installation logic initializes data and configuration when the extension is installed, independently of subsequent upgrades
  2. Upgrade logic maps existing tenant data to the new schema during an app version transition
  3. Continuous integration should produce the same versioned package from controlled source and dependencies for promotion
  4. The AL debugger exposes call flow and variable state at the problematic trigger or subscriber

Explanation

Correct Answer

A:

Installation logic initializes data and configuration when the extension is installed, independently of subsequent upgrades. It connects the proposed action to the exact failure or requirement—A new tenant install requires initial setup records and default feature flags before users start work. Confirmation would be a fresh test tenant installs the app and receives the expected setup records exactly once.

Incorrect Answers

B:

That mechanism explains why the alternative action—implement an upgrade codeunit and rehearse migration on representative historical records—helps in another case. It does not justify the proposed fix here; installation logic initializes data and configuration when the extension is installed, independently of subsequent upgrades. The distinguishing requirement is: A new tenant install requires initial setup records and default feature flags before users start work.

C:

That mechanism explains why the alternative action—use a reproducible al build and release pipeline with fixed source revision and dependency versions—helps in another case. It does not justify the proposed fix here; installation logic initializes data and configuration when the extension is installed, independently of subsequent upgrades. The distinguishing requirement is: A new tenant install requires initial setup records and default feature flags before users start work.

D:

That mechanism explains why the alternative action—set vs code breakpoints and debug the extension execution path in the sandbox—helps in another case. It does not justify the proposed fix here; installation logic initializes data and configuration when the extension is installed, independently of subsequent upgrades. The distinguishing requirement is: A new tenant install requires initial setup records and default feature flags before users start work.

Question 175

A new tenant install requires initial setup records and default feature flags before users start work. The team implemented a change aligned with this plan: Include the appropriate install codeunit and verify its first-install behavior. Which acceptance result specifically verifies that the reported problem is resolved?

  1. An upgraded sandbox retains expected historical records and new lookups work after the migration
  2. A fresh test tenant installs the app and receives the expected setup records exactly once
  3. Artifact metadata, test results, and release logs all trace to the same approved source commit
  4. A reproducing transaction reaches the breakpoint and the inspected values explain the failing branch

Explanation

Correct Answer

B:

A fresh test tenant installs the app and receives the expected setup records exactly once. This is stronger than an unrelated health check because the desired design action is include the appropriate install codeunit and verify its first-install behavior, and installation logic initializes data and configuration when the extension is installed, independently of subsequent upgrades. The local requirement is: A new tenant install requires initial setup records and default feature flags before users start work.

Incorrect Answers

A:

This would verify implement an upgrade codeunit and rehearse migration on representative historical records, which addresses a different engineering need. It does not demonstrate that the current issue is resolved: A new tenant install requires initial setup records and default feature flags before users start work. The decisive local proof is a fresh test tenant installs the app and receives the expected setup records exactly once.

C:

This would verify use a reproducible al build and release pipeline with fixed source revision and dependency versions, which addresses a different engineering need. It does not demonstrate that the current issue is resolved: A new tenant install requires initial setup records and default feature flags before users start work. The decisive local proof is a fresh test tenant installs the app and receives the expected setup records exactly once.

D:

This would verify set vs code breakpoints and debug the extension execution path in the sandbox, which addresses a different engineering need. It does not demonstrate that the current issue is resolved: A new tenant install requires initial setup records and default feature flags before users start work. The decisive local proof is a fresh test tenant installs the app and receives the expected setup records exactly once.

Question 176

A new tenant install requires initial setup records and default feature flags before users start work. A targeted trial still reproduces the original gap after the team attempted this change: Include the appropriate install codeunit and verify its first-install behavior. Which repair directly addresses the remaining defect?

  1. Fix the upgrade codeunit's data conversion and validate the migration against a restored old-version dataset
  2. Repair dependency pinning and artifact promotion so the pipeline deploys only its validated build
  3. Add or correct the install hook and rerun fresh-install tests with clean tenant state
  4. Point the debugger at the correct environment and executable path, then reproduce and inspect the failing AL call

Explanation

Correct Answer

C:

Add or correct the install hook and rerun fresh-install tests with clean tenant state. This directly addresses the remaining defect for the requirement—A new tenant install requires initial setup records and default feature flags before users start work. It restores the mechanism described here: installation logic initializes data and configuration when the extension is installed, independently of subsequent upgrades.

Incorrect Answers

A:

This correction is for the separate condition: An add-on introduces a revised subscription key and upgrading a populated tenant loses legacy mappings. It would not directly restore the intended behavior in this situation: A new tenant install requires initial setup records and default feature flags before users start work. Here, add or correct the install hook and rerun fresh-install tests with clean tenant state, because installation logic initializes data and configuration when the extension is installed, independently of subsequent upgrades.

B:

This correction is for the separate condition: An extension build generated from one commit works locally but deployment carries an older artifact from another branch. It would not directly restore the intended behavior in this situation: A new tenant install requires initial setup records and default feature flags before users start work. Here, add or correct the install hook and rerun fresh-install tests with clean tenant state, because installation logic initializes data and configuration when the extension is installed, independently of subsequent upgrades.

D:

This correction is for the separate condition: A supplier rebate extension fails only in a particular codeunit path and support needs to inspect live variables safely in a sandbox. It would not directly restore the intended behavior in this situation: A new tenant install requires initial setup records and default feature flags before users start work. Here, add or correct the install hook and rerun fresh-install tests with clean tenant state, because installation logic initializes data and configuration when the extension is installed, independently of subsequent upgrades.

Question 177

A data field changes structure in an extension update while existing invoice records must be migrated. Which single AL development or architecture change best resolves this requirement without redesigning unrelated workflows?

  1. Implement an upgrade codeunit and rehearse migration on representative historical records
  2. Use a reproducible AL build and release pipeline with fixed source revision and dependency versions
  3. Set VS Code breakpoints and debug the extension execution path in the sandbox
  4. Build the AL project into an .app package and promote the tested artifact through the release process

Explanation

Correct Answer

A:

This targets the concrete requirement—A data field changes structure in an extension update while existing invoice records must be migrated. Upgrade logic maps existing tenant data to the new schema during an app version transition. The team can establish success when an upgraded sandbox retains expected historical records and new lookups work after the migration.

Incorrect Answers

B:

This choice primarily fits a different requirement: A package passes interactive deployment but fails after a CI build because the pipeline uses inconsistent dependencies. There, continuous integration should produce the same versioned package from controlled source and dependencies for promotion. In the current situation, A data field changes structure in an extension update while existing invoice records must be migrated. Upgrade logic maps existing tenant data to the new schema during an app version transition. Acceptance requires an upgraded sandbox retains expected historical records and new lookups work after the migration.

C:

This choice primarily fits a different requirement: An AL developer needs to inspect a record value while a purchase posting subscriber unexpectedly throws an error. There, the al debugger exposes call flow and variable state at the problematic trigger or subscriber. In the current situation, A data field changes structure in an extension update while existing invoice records must be migrated. Upgrade logic maps existing tenant data to the new schema during an app version transition. Acceptance requires an upgraded sandbox retains expected historical records and new lookups work after the migration.

D:

This choice primarily fits a different requirement: A partner needs to deliver a signed-off AL extension binary to an administrator without deploying from a developer workstation. There, al packaging provides a deployable extension artifact decoupled from the developer's interactive editor session. In the current situation, A data field changes structure in an extension update while existing invoice records must be migrated. Upgrade logic maps existing tenant data to the new schema during an app version transition. Acceptance requires an upgraded sandbox retains expected historical records and new lookups work after the migration.

Question 178

A data field changes structure in an extension update while existing invoice records must be migrated. The developer recommends the following change: Implement an upgrade codeunit and rehearse migration on representative historical records. Which technical explanation most directly justifies it in this case?

  1. Continuous integration should produce the same versioned package from controlled source and dependencies for promotion
  2. Upgrade logic maps existing tenant data to the new schema during an app version transition
  3. The AL debugger exposes call flow and variable state at the problematic trigger or subscriber
  4. AL packaging provides a deployable extension artifact decoupled from the developer's interactive editor session

Explanation

Correct Answer

B:

Upgrade logic maps existing tenant data to the new schema during an app version transition. It connects the proposed action to the exact failure or requirement—A data field changes structure in an extension update while existing invoice records must be migrated. Confirmation would be an upgraded sandbox retains expected historical records and new lookups work after the migration.

Incorrect Answers

A:

That mechanism explains why the alternative action—use a reproducible al build and release pipeline with fixed source revision and dependency versions—helps in another case. It does not justify the proposed fix here; upgrade logic maps existing tenant data to the new schema during an app version transition. The distinguishing requirement is: A data field changes structure in an extension update while existing invoice records must be migrated.

C:

That mechanism explains why the alternative action—set vs code breakpoints and debug the extension execution path in the sandbox—helps in another case. It does not justify the proposed fix here; upgrade logic maps existing tenant data to the new schema during an app version transition. The distinguishing requirement is: A data field changes structure in an extension update while existing invoice records must be migrated.

D:

That mechanism explains why the alternative action—build the al project into an .app package and promote the tested artifact through the release process—helps in another case. It does not justify the proposed fix here; upgrade logic maps existing tenant data to the new schema during an app version transition. The distinguishing requirement is: A data field changes structure in an extension update while existing invoice records must be migrated.

Question 179

A data field changes structure in an extension update while existing invoice records must be migrated. The team implemented a change aligned with this plan: Implement an upgrade codeunit and rehearse migration on representative historical records. Which acceptance result specifically verifies that the reported problem is resolved?

  1. Artifact metadata, test results, and release logs all trace to the same approved source commit
  2. A reproducing transaction reaches the breakpoint and the inspected values explain the failing branch
  3. An upgraded sandbox retains expected historical records and new lookups work after the migration
  4. The promoted package ID and version match the tested build and installation passes smoke checks

Explanation

Correct Answer

C:

An upgraded sandbox retains expected historical records and new lookups work after the migration. This is stronger than an unrelated health check because the desired design action is implement an upgrade codeunit and rehearse migration on representative historical records, and upgrade logic maps existing tenant data to the new schema during an app version transition. The local requirement is: A data field changes structure in an extension update while existing invoice records must be migrated.

Incorrect Answers

A:

This would verify use a reproducible al build and release pipeline with fixed source revision and dependency versions, which addresses a different engineering need. It does not demonstrate that the current issue is resolved: A data field changes structure in an extension update while existing invoice records must be migrated. The decisive local proof is an upgraded sandbox retains expected historical records and new lookups work after the migration.

B:

This would verify set vs code breakpoints and debug the extension execution path in the sandbox, which addresses a different engineering need. It does not demonstrate that the current issue is resolved: A data field changes structure in an extension update while existing invoice records must be migrated. The decisive local proof is an upgraded sandbox retains expected historical records and new lookups work after the migration.

D:

This would verify build the al project into an .app package and promote the tested artifact through the release process, which addresses a different engineering need. It does not demonstrate that the current issue is resolved: A data field changes structure in an extension update while existing invoice records must be migrated. The decisive local proof is an upgraded sandbox retains expected historical records and new lookups work after the migration.

Question 180

A data field changes structure in an extension update while existing invoice records must be migrated. A targeted trial still reproduces the original gap after the team attempted this change: Implement an upgrade codeunit and rehearse migration on representative historical records. Which repair directly addresses the remaining defect?

  1. Repair dependency pinning and artifact promotion so the pipeline deploys only its validated build
  2. Point the debugger at the correct environment and executable path, then reproduce and inspect the failing AL call
  3. Rebuild from the approved source revision and deploy that package rather than an untracked local copy
  4. Fix the upgrade codeunit's data conversion and validate the migration against a restored old-version dataset

Explanation

Correct Answer

D:

Fix the upgrade codeunit's data conversion and validate the migration against a restored old-version dataset. This directly addresses the remaining defect for the requirement—A data field changes structure in an extension update while existing invoice records must be migrated. It restores the mechanism described here: upgrade logic maps existing tenant data to the new schema during an app version transition.

Incorrect Answers

A:

This correction is for the separate condition: An extension build generated from one commit works locally but deployment carries an older artifact from another branch. It would not directly restore the intended behavior in this situation: A data field changes structure in an extension update while existing invoice records must be migrated. Here, fix the upgrade codeunit's data conversion and validate the migration against a restored old-version dataset, because upgrade logic maps existing tenant data to the new schema during an app version transition.

B:

This correction is for the separate condition: A supplier rebate extension fails only in a particular codeunit path and support needs to inspect live variables safely in a sandbox. It would not directly restore the intended behavior in this situation: A data field changes structure in an extension update while existing invoice records must be migrated. Here, fix the upgrade codeunit's data conversion and validate the migration against a restored old-version dataset, because upgrade logic maps existing tenant data to the new schema during an app version transition.

C:

This correction is for the separate condition: A release engineer must move a tested finance extension into a managed deployment pipeline from source control. It would not directly restore the intended behavior in this situation: A data field changes structure in an extension update while existing invoice records must be migrated. Here, fix the upgrade codeunit's data conversion and validate the migration against a restored old-version dataset, because upgrade logic maps existing tenant data to the new schema during an app version transition.


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