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MB-820 Premium File: 131 Questions & Answers

Last Update: Oct 12, 2026

MB-820 PDF Study Guide: 948 Pages

$74.99

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Microsoft MB-820 Practice Test 78

Question 770

An external BI platform needs joined purchase and vendor values as read-only aggregated data over REST. The developer recommends the following change: Use an API query object for read-only combined or aggregated data exposure. Which technical explanation most directly justifies it in this case?

  1. Published API versions allow consumers to migrate deliberately without silently breaking existing calls
  2. API queries support versioned read-only REST datasets including joins or aggregation across relevant dataitems
  3. A bound action associates an operation with a specific entity and executes logic beyond direct field CRUD
  4. Read scale-out can direct suitable read requests to a secondary database replica where the deployment supports it

Explanation

Correct Answer

B:

API queries support versioned read-only REST datasets including joins or aggregation across relevant dataitems. It connects the proposed action to the exact failure or requirement—An external BI platform needs joined purchase and vendor values as read-only aggregated data over REST. Confirmation would be the endpoint returns expected joined or grouped records and does not offer mutation semantics.

Incorrect Answers

A:

That mechanism explains why the alternative action—maintain explicit api versions and add a new compatible api version for the changed contract—helps in another case. It does not justify the proposed fix here; api queries support versioned read-only rest datasets including joins or aggregation across relevant dataitems. The distinguishing requirement is: An external BI platform needs joined purchase and vendor values as read-only aggregated data over REST.

C:

That mechanism explains why the alternative action—expose a suitable bound odata action with business logic for the target entity—helps in another case. It does not justify the proposed fix here; api queries support versioned read-only rest datasets including joins or aggregation across relevant dataitems. The distinguishing requirement is: An external BI platform needs joined purchase and vendor values as read-only aggregated data over REST.

D:

That mechanism explains why the alternative action—evaluate supported read scale-out configuration for compatible Business Central api read traffic—helps in another case. It does not justify the proposed fix here; api queries support versioned read-only rest datasets including joins or aggregation across relevant dataitems. The distinguishing requirement is: An external BI platform needs joined purchase and vendor values as read-only aggregated data over REST.

Question 771

An external BI platform needs joined purchase and vendor values as read-only aggregated data over REST. The team implemented a change aligned with this plan: Use an API query object for read-only combined or aggregated data exposure. Which acceptance result specifically verifies that the reported problem is resolved?

  1. Both approved versions return the documented shapes while clients can opt in to the new version
  2. Calling the action against a permitted record runs the intended validation and returns the expected response
  3. The endpoint returns expected joined or grouped records and does not offer mutation semantics
  4. Supported read-only requests return consistent allowed data while primary write operations remain on the proper path

Explanation

Correct Answer

C:

The endpoint returns expected joined or grouped records and does not offer mutation semantics. This is stronger than an unrelated health check because the desired design action is use an api query object for read-only combined or aggregated data exposure, and api queries support versioned read-only rest datasets including joins or aggregation across relevant dataitems. The local requirement is: An external BI platform needs joined purchase and vendor values as read-only aggregated data over REST.

Incorrect Answers

A:

This would verify maintain explicit api versions and add a new compatible api version for the changed contract, which addresses a different engineering need. It does not demonstrate that the current issue is resolved: An external BI platform needs joined purchase and vendor values as read-only aggregated data over REST. The decisive local proof is the endpoint returns expected joined or grouped records and does not offer mutation semantics.

B:

This would verify expose a suitable bound odata action with business logic for the target entity, which addresses a different engineering need. It does not demonstrate that the current issue is resolved: An external BI platform needs joined purchase and vendor values as read-only aggregated data over REST. The decisive local proof is the endpoint returns expected joined or grouped records and does not offer mutation semantics.

D:

This would verify evaluate supported read scale-out configuration for compatible Business Central api read traffic, which addresses a different engineering need. It does not demonstrate that the current issue is resolved: An external BI platform needs joined purchase and vendor values as read-only aggregated data over REST. The decisive local proof is the endpoint returns expected joined or grouped records and does not offer mutation semantics.

Question 772

An external BI platform needs joined purchase and vendor values as read-only aggregated data over REST. A targeted trial still reproduces the original gap after the team attempted this change: Use an API query object for read-only combined or aggregated data exposure. Which repair directly addresses the remaining defect?

  1. Restore the old contract and publish the changed schema through a distinct supported API version
  2. Correct the bound action registration and handler implementation so it targets the record safely
  3. Correct the API read-only configuration and workload routing, and verify platform-specific read-scale-out support
  4. Replace a write-oriented API page design with a properly structured API query and correct grouping

Explanation

Correct Answer

D:

Replace a write-oriented API page design with a properly structured API query and correct grouping. This directly addresses the remaining defect for the requirement—An external BI platform needs joined purchase and vendor values as read-only aggregated data over REST. It restores the mechanism described here: api queries support versioned read-only rest datasets including joins or aggregation across relevant dataitems.

Incorrect Answers

A:

This correction is for the separate condition: A shipping integration adds new fields but a legacy partner still depends on the old endpoint contract. It would not directly restore the intended behavior in this situation: An external BI platform needs joined purchase and vendor values as read-only aggregated data over REST. Here, replace a write-oriented api page design with a properly structured api query and correct grouping, because api queries support versioned read-only rest datasets including joins or aggregation across relevant dataitems.

B:

This correction is for the separate condition: A logistics integration must request a controlled operation that applies business validation to an existing record. It would not directly restore the intended behavior in this situation: An external BI platform needs joined purchase and vendor values as read-only aggregated data over REST. Here, replace a write-oriented api page design with a properly structured api query and correct grouping, because api queries support versioned read-only rest datasets including joins or aggregation across relevant dataitems.

C:

This correction is for the separate condition: A finance analytics integration wants to read committed reporting data from an appropriate secondary replica where supported. It would not directly restore the intended behavior in this situation: An external BI platform needs joined purchase and vendor values as read-only aggregated data over REST. Here, replace a write-oriented api page design with a properly structured api query and correct grouping, because api queries support versioned read-only rest datasets including joins or aggregation across relevant dataitems.

Question 773

An external dashboard wants grouped sales totals from several tables but no write access through the endpoint. Which single AL development or architecture change best resolves this requirement without redesigning unrelated workflows?

  1. Maintain explicit API versions and add a new compatible API version for the changed contract
  2. Use an API query object for read-only combined or aggregated data exposure
  3. Expose a suitable bound OData action with business logic for the target entity
  4. Evaluate supported read scale-out configuration for compatible Business Central API read traffic

Explanation

Correct Answer

B:

This targets the concrete requirement—An external dashboard wants grouped sales totals from several tables but no write access through the endpoint. API queries support versioned read-only REST datasets including joins or aggregation across relevant dataitems. The team can establish success when the endpoint returns expected joined or grouped records and does not offer mutation semantics.

Incorrect Answers

A:

This choice primarily fits a different requirement: An extension releases a breaking response-shape change and existing API clients must remain on the previous contract. There, published api versions allow consumers to migrate deliberately without silently breaking existing calls. In the current situation, An external dashboard wants grouped sales totals from several tables but no write access through the endpoint. API queries support versioned read-only REST datasets including joins or aggregation across relevant dataitems. Acceptance requires the endpoint returns expected joined or grouped records and does not offer mutation semantics.

C:

This choice primarily fits a different requirement: A client needs to trigger a Business Central business action on a specific document rather than directly editing many fields. There, a bound action associates an operation with a specific entity and executes logic beyond direct field crud. In the current situation, An external dashboard wants grouped sales totals from several tables but no write access through the endpoint. API queries support versioned read-only REST datasets including joins or aggregation across relevant dataitems. Acceptance requires the endpoint returns expected joined or grouped records and does not offer mutation semantics.

D:

This choice primarily fits a different requirement: A high-volume external reporting client produces unnecessary primary-database load with read-heavy API queries. There, read scale-out can direct suitable read requests to a secondary database replica where the deployment supports it. In the current situation, An external dashboard wants grouped sales totals from several tables but no write access through the endpoint. API queries support versioned read-only REST datasets including joins or aggregation across relevant dataitems. Acceptance requires the endpoint returns expected joined or grouped records and does not offer mutation semantics.

Question 774

An external dashboard wants grouped sales totals from several tables but no write access through the endpoint. The developer recommends the following change: Use an API query object for read-only combined or aggregated data exposure. Which technical explanation most directly justifies it in this case?

  1. Published API versions allow consumers to migrate deliberately without silently breaking existing calls
  2. A bound action associates an operation with a specific entity and executes logic beyond direct field CRUD
  3. API queries support versioned read-only REST datasets including joins or aggregation across relevant dataitems
  4. Read scale-out can direct suitable read requests to a secondary database replica where the deployment supports it

Explanation

Correct Answer

C:

API queries support versioned read-only REST datasets including joins or aggregation across relevant dataitems. It connects the proposed action to the exact failure or requirement—An external dashboard wants grouped sales totals from several tables but no write access through the endpoint. Confirmation would be the endpoint returns expected joined or grouped records and does not offer mutation semantics.

Incorrect Answers

A:

That mechanism explains why the alternative action—maintain explicit api versions and add a new compatible api version for the changed contract—helps in another case. It does not justify the proposed fix here; api queries support versioned read-only rest datasets including joins or aggregation across relevant dataitems. The distinguishing requirement is: An external dashboard wants grouped sales totals from several tables but no write access through the endpoint.

B:

That mechanism explains why the alternative action—expose a suitable bound odata action with business logic for the target entity—helps in another case. It does not justify the proposed fix here; api queries support versioned read-only rest datasets including joins or aggregation across relevant dataitems. The distinguishing requirement is: An external dashboard wants grouped sales totals from several tables but no write access through the endpoint.

D:

That mechanism explains why the alternative action—evaluate supported read scale-out configuration for compatible Business Central api read traffic—helps in another case. It does not justify the proposed fix here; api queries support versioned read-only rest datasets including joins or aggregation across relevant dataitems. The distinguishing requirement is: An external dashboard wants grouped sales totals from several tables but no write access through the endpoint.

Question 775

An external dashboard wants grouped sales totals from several tables but no write access through the endpoint. The team implemented a change aligned with this plan: Use an API query object for read-only combined or aggregated data exposure. Which acceptance result specifically verifies that the reported problem is resolved?

  1. Both approved versions return the documented shapes while clients can opt in to the new version
  2. Calling the action against a permitted record runs the intended validation and returns the expected response
  3. Supported read-only requests return consistent allowed data while primary write operations remain on the proper path
  4. The endpoint returns expected joined or grouped records and does not offer mutation semantics

Explanation

Correct Answer

D:

The endpoint returns expected joined or grouped records and does not offer mutation semantics. This is stronger than an unrelated health check because the desired design action is use an api query object for read-only combined or aggregated data exposure, and api queries support versioned read-only rest datasets including joins or aggregation across relevant dataitems. The local requirement is: An external dashboard wants grouped sales totals from several tables but no write access through the endpoint.

Incorrect Answers

A:

This would verify maintain explicit api versions and add a new compatible api version for the changed contract, which addresses a different engineering need. It does not demonstrate that the current issue is resolved: An external dashboard wants grouped sales totals from several tables but no write access through the endpoint. The decisive local proof is the endpoint returns expected joined or grouped records and does not offer mutation semantics.

B:

This would verify expose a suitable bound odata action with business logic for the target entity, which addresses a different engineering need. It does not demonstrate that the current issue is resolved: An external dashboard wants grouped sales totals from several tables but no write access through the endpoint. The decisive local proof is the endpoint returns expected joined or grouped records and does not offer mutation semantics.

C:

This would verify evaluate supported read scale-out configuration for compatible Business Central api read traffic, which addresses a different engineering need. It does not demonstrate that the current issue is resolved: An external dashboard wants grouped sales totals from several tables but no write access through the endpoint. The decisive local proof is the endpoint returns expected joined or grouped records and does not offer mutation semantics.

Question 776

An external dashboard wants grouped sales totals from several tables but no write access through the endpoint. A targeted trial still reproduces the original gap after the team attempted this change: Use an API query object for read-only combined or aggregated data exposure. Which repair directly addresses the remaining defect?

  1. Replace a write-oriented API page design with a properly structured API query and correct grouping
  2. Restore the old contract and publish the changed schema through a distinct supported API version
  3. Correct the bound action registration and handler implementation so it targets the record safely
  4. Correct the API read-only configuration and workload routing, and verify platform-specific read-scale-out support

Explanation

Correct Answer

A:

Replace a write-oriented API page design with a properly structured API query and correct grouping. This directly addresses the remaining defect for the requirement—An external dashboard wants grouped sales totals from several tables but no write access through the endpoint. It restores the mechanism described here: api queries support versioned read-only rest datasets including joins or aggregation across relevant dataitems.

Incorrect Answers

B:

This correction is for the separate condition: A shipping integration adds new fields but a legacy partner still depends on the old endpoint contract. It would not directly restore the intended behavior in this situation: An external dashboard wants grouped sales totals from several tables but no write access through the endpoint. Here, replace a write-oriented api page design with a properly structured api query and correct grouping, because api queries support versioned read-only rest datasets including joins or aggregation across relevant dataitems.

C:

This correction is for the separate condition: A logistics integration must request a controlled operation that applies business validation to an existing record. It would not directly restore the intended behavior in this situation: An external dashboard wants grouped sales totals from several tables but no write access through the endpoint. Here, replace a write-oriented api page design with a properly structured api query and correct grouping, because api queries support versioned read-only rest datasets including joins or aggregation across relevant dataitems.

D:

This correction is for the separate condition: A finance analytics integration wants to read committed reporting data from an appropriate secondary replica where supported. It would not directly restore the intended behavior in this situation: An external dashboard wants grouped sales totals from several tables but no write access through the endpoint. Here, replace a write-oriented api page design with a properly structured api query and correct grouping, because api queries support versioned read-only rest datasets including joins or aggregation across relevant dataitems.

Question 777

An extension releases a breaking response-shape change and existing API clients must remain on the previous contract. Which single AL development or architecture change best resolves this requirement without redesigning unrelated workflows?

  1. Expose a suitable bound OData action with business logic for the target entity
  2. Evaluate supported read scale-out configuration for compatible Business Central API read traffic
  3. Maintain explicit API versions and add a new compatible API version for the changed contract
  4. Create an appropriate PageType API page with stable publisher, group, version and entity definitions

Explanation

Correct Answer

C:

This targets the concrete requirement—An extension releases a breaking response-shape change and existing API clients must remain on the previous contract. Published API versions allow consumers to migrate deliberately without silently breaking existing calls. The team can establish success when both approved versions return the documented shapes while clients can opt in to the new version.

Incorrect Answers

A:

This choice primarily fits a different requirement: A client needs to trigger a Business Central business action on a specific document rather than directly editing many fields. There, a bound action associates an operation with a specific entity and executes logic beyond direct field crud. In the current situation, An extension releases a breaking response-shape change and existing API clients must remain on the previous contract. Published API versions allow consumers to migrate deliberately without silently breaking existing calls. Acceptance requires both approved versions return the documented shapes while clients can opt in to the new version.

B:

This choice primarily fits a different requirement: A high-volume external reporting client produces unnecessary primary-database load with read-heavy API queries. There, read scale-out can direct suitable read requests to a secondary database replica where the deployment supports it. In the current situation, An extension releases a breaking response-shape change and existing API clients must remain on the previous contract. Published API versions allow consumers to migrate deliberately without silently breaking existing calls. Acceptance requires both approved versions return the documented shapes while clients can opt in to the new version.

D:

This choice primarily fits a different requirement: A customer-facing system needs a versioned Business Central REST endpoint to create and update shipment confirmation records. There, api pages provide versioned restful odata endpoints supporting entity crud for a source table. In the current situation, An extension releases a breaking response-shape change and existing API clients must remain on the previous contract. Published API versions allow consumers to migrate deliberately without silently breaking existing calls. Acceptance requires both approved versions return the documented shapes while clients can opt in to the new version.

Question 778

An extension releases a breaking response-shape change and existing API clients must remain on the previous contract. The developer recommends the following change: Maintain explicit API versions and add a new compatible API version for the changed contract. Which technical explanation most directly justifies it in this case?

  1. A bound action associates an operation with a specific entity and executes logic beyond direct field CRUD
  2. Read scale-out can direct suitable read requests to a secondary database replica where the deployment supports it
  3. API pages provide versioned RESTful OData endpoints supporting entity CRUD for a source table
  4. Published API versions allow consumers to migrate deliberately without silently breaking existing calls

Explanation

Correct Answer

D:

Published API versions allow consumers to migrate deliberately without silently breaking existing calls. It connects the proposed action to the exact failure or requirement—An extension releases a breaking response-shape change and existing API clients must remain on the previous contract. Confirmation would be both approved versions return the documented shapes while clients can opt in to the new version.

Incorrect Answers

A:

That mechanism explains why the alternative action—expose a suitable bound odata action with business logic for the target entity—helps in another case. It does not justify the proposed fix here; published api versions allow consumers to migrate deliberately without silently breaking existing calls. The distinguishing requirement is: An extension releases a breaking response-shape change and existing API clients must remain on the previous contract.

B:

That mechanism explains why the alternative action—evaluate supported read scale-out configuration for compatible Business Central api read traffic—helps in another case. It does not justify the proposed fix here; published api versions allow consumers to migrate deliberately without silently breaking existing calls. The distinguishing requirement is: An extension releases a breaking response-shape change and existing API clients must remain on the previous contract.

C:

That mechanism explains why the alternative action—create an appropriate pagetype api page with stable publisher, group, version and entity definitions—helps in another case. It does not justify the proposed fix here; published api versions allow consumers to migrate deliberately without silently breaking existing calls. The distinguishing requirement is: An extension releases a breaking response-shape change and existing API clients must remain on the previous contract.

Question 779

An extension releases a breaking response-shape change and existing API clients must remain on the previous contract. The team implemented a change aligned with this plan: Maintain explicit API versions and add a new compatible API version for the changed contract. Which acceptance result specifically verifies that the reported problem is resolved?

  1. Both approved versions return the documented shapes while clients can opt in to the new version
  2. Calling the action against a permitted record runs the intended validation and returns the expected response
  3. Supported read-only requests return consistent allowed data while primary write operations remain on the proper path
  4. Authorized GET, POST and PATCH tests satisfy the endpoint's entity contract and enforced business rules

Explanation

Correct Answer

A:

Both approved versions return the documented shapes while clients can opt in to the new version. This is stronger than an unrelated health check because the desired design action is maintain explicit api versions and add a new compatible api version for the changed contract, and published api versions allow consumers to migrate deliberately without silently breaking existing calls. The local requirement is: An extension releases a breaking response-shape change and existing API clients must remain on the previous contract.

Incorrect Answers

B:

This would verify expose a suitable bound odata action with business logic for the target entity, which addresses a different engineering need. It does not demonstrate that the current issue is resolved: An extension releases a breaking response-shape change and existing API clients must remain on the previous contract. The decisive local proof is both approved versions return the documented shapes while clients can opt in to the new version.

C:

This would verify evaluate supported read scale-out configuration for compatible Business Central api read traffic, which addresses a different engineering need. It does not demonstrate that the current issue is resolved: An extension releases a breaking response-shape change and existing API clients must remain on the previous contract. The decisive local proof is both approved versions return the documented shapes while clients can opt in to the new version.

D:

This would verify create an appropriate pagetype api page with stable publisher, group, version and entity definitions, which addresses a different engineering need. It does not demonstrate that the current issue is resolved: An extension releases a breaking response-shape change and existing API clients must remain on the previous contract. The decisive local proof is both approved versions return the documented shapes while clients can opt in to the new version.

Question 780

An extension releases a breaking response-shape change and existing API clients must remain on the previous contract. A targeted trial still reproduces the original gap after the team attempted this change: Maintain explicit API versions and add a new compatible API version for the changed contract. Which repair directly addresses the remaining defect?

  1. Correct the bound action registration and handler implementation so it targets the record safely
  2. Restore the old contract and publish the changed schema through a distinct supported API version
  3. Correct the API read-only configuration and workload routing, and verify platform-specific read-scale-out support
  4. Define a new API page with the correct entity properties and operations instead of extending a standard API page

Explanation

Correct Answer

B:

Restore the old contract and publish the changed schema through a distinct supported API version. This directly addresses the remaining defect for the requirement—An extension releases a breaking response-shape change and existing API clients must remain on the previous contract. It restores the mechanism described here: published api versions allow consumers to migrate deliberately without silently breaking existing calls.

Incorrect Answers

A:

This correction is for the separate condition: A logistics integration must request a controlled operation that applies business validation to an existing record. It would not directly restore the intended behavior in this situation: An extension releases a breaking response-shape change and existing API clients must remain on the previous contract. Here, restore the old contract and publish the changed schema through a distinct supported api version, because published api versions allow consumers to migrate deliberately without silently breaking existing calls.

C:

This correction is for the separate condition: A finance analytics integration wants to read committed reporting data from an appropriate secondary replica where supported. It would not directly restore the intended behavior in this situation: An extension releases a breaking response-shape change and existing API clients must remain on the previous contract. Here, restore the old contract and publish the changed schema through a distinct supported api version, because published api versions allow consumers to migrate deliberately without silently breaking existing calls.

D:

This correction is for the separate condition: A field service app needs a writable Business Central API for an extension's custom maintenance records. It would not directly restore the intended behavior in this situation: An extension releases a breaking response-shape change and existing API clients must remain on the previous contract. Here, restore the old contract and publish the changed schema through a distinct supported api version, because published api versions allow consumers to migrate deliberately without silently breaking existing calls.


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