DEX-403 Exam Guide, Objectives & Preparation

Exam Overview

Exam Code	DEX-403
Exam Name	Salesforce Declarative Development for Platform App Builders in Lightning Experience
Vendor	Salesforce
Total Questions	291
Last Updated	26-Oct, 2026

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Free DEX-403 Practice Questions

Explore 5 free practice questions for the Salesforce DEX-403 exam and review the answers and explanations to support your preparation.

Question 1
Single answer

DreamHouse Realty wants to make sure an Opportunity has a field Expected_Close_Date_c populated before it is allowed to enter the qualified stage. How should an app builder solution this request?
- Option A:
  Record Type
  Correct
- Option B:
  Validation Rule
  Correct
- Option C:
  Activity History
  Correct
- Option D:
  Page Layout
  Correct
Show Answer & Explanation Hide Answer & Explanation

Correct Answer: B

Explanation

A validation rule is a formula that evaluates the data in one or more fields and returns a value of “True” or “False”. Validation rules verify that the data a user enters in a record meets the standards you specify before the user can save the record. In this case, a validation rule can be used to check if the Expected_Close_Date_c field is populated before the Opportunity stage is set to qualified
Question 2
Single answer

An app builder notices several Accounts converted from Leads are missing information they expected to be caught via Account validation rules. What could be the source of this issue?
- Option A:
  The lead settings are unchecked to require validation for converted leads.
  Correct
- Option B:
  Account validation rules fail to validate on records converted from a lead.
  Correct
- Option C:
  The lead settings are allowing users to intentionally bypass validation rules.
  Correct
- Option D:
  Lead validation rules fail to validate on records when they are being converted.
  Correct
Show Answer & Explanation Hide Answer & Explanation

Correct Answer: A

Explanation

The lead settings have an option to require validation for converted leads. If this option is unchecked, then the Account validation rules will not be enforced when a lead is converted to an Account. This could result in missing or incorrect information on the Account records.
Question 3
Multiple answers

An App Builder at UVC would like to prevent users from creating new records on an Account related list by overriding standard buttons. Which two should the App Builder consider before overriding standard buttons?
- Option A:
  Standard buttons can be changed on lookup dialogs, list views, and search result layouts
  Correct
- Option B:
  Standard buttons can be overridden with a Visualforce page
  Correct
- Option C:
  Standard buttons that are not available for overrides can still be hidden on page layouts
  Correct
- Option D:
  Standard buttons can be overridden, relocated on the detail page, and relabeled
  Correct
Show Answer & Explanation Hide Answer & Explanation

Correct Answer: B, C

Explanation

Standard buttons can be overridden with a Visualforce page to provide custom functionality or user interface. For example, you can override the New button on an object to display a custom Visualforce page instead of the standard page layout3. Standard buttons that are not available for overrides can still be hidden on page layouts to prevent users from accessing them. For example, you can hide the Delete button on an object to prevent users from deleting records.
Question 4
Single answer

The Service Manager provided the app builder with color code requirements for case age on open cases. New cases populate a green circle Day-old cases populate a yellow circle Three-day-old cases populate a red circle How should an app builder implement this requirement?
- Option A:
  Formula Field
  Correct
- Option B:
  Quick Action
  Correct
- Option C:
  Custom Button
  Correct
- Option D:
  Lightning Web Component
  Correct
Show Answer & Explanation Hide Answer & Explanation

Correct Answer: A

Explanation

A formula field is a read-only field that derives its value from a formula expression you define. The formula field is updated when any of the source fields change. You can use formula fields to display images based on certain conditions. In this case, a formula field can be used to display a green, yellow, or red circle image based on the case age.
Question 5
Single answer

At Universal Containers, the Account object has a Master-Detail relationship with an Invoice custom object. The App Builder would like to change to a lookup field, but is not able to do so. What could be causing this?
- Option A:
  The invoice must have at least one Master-Detail field for reporting.
  Correct
- Option B:
  The Account record includes Invoice roll-up summary fields.
  Correct
- Option C:
  The Invoice records have existing values in the Account.
  Correct
- Option D:
  The Account is included in the workflow on the Invoice object.
  Correct
Show Answer & Explanation Hide Answer & Explanation

Correct Answer: B

Explanation

The Account record includes Invoice roll-up summary fields. This is correct because roll-up summary fields are only available on the master object in a master-detail relationship, and changing the field type to lookup would delete the roll-up summary fields

Free DEX-403 Practice Questions

Question 1

DreamHouse Realty wants to make sure an Opportunity has a field Expected_Close_Date_c populated before it is allowed to enter the qualified stage. How should an app builder solution this request?

Record Type

Validation Rule

Activity History

Page Layout

Question 2

An app builder notices several Accounts converted from Leads are missing information they expected to be caught via Account validation rules. What could be the source of this issue?

The lead settings are unchecked to require validation for converted leads.

Account validation rules fail to validate on records converted from a lead.

The lead settings are allowing users to intentionally bypass validation rules.

Lead validation rules fail to validate on records when they are being converted.

The lead settings have an option to require validation for converted leads. If this option is unchecked, then the Account validation rules will not be enforced when a lead is converted to an Account. This could result in missing or incorrect information on the Account records.

Question 3

An App Builder at UVC would like to prevent users from creating new records on an Account related list by overriding standard buttons. Which two should the App Builder consider before overriding standard buttons?

Standard buttons can be changed on lookup dialogs, list views, and search result layouts

Standard buttons can be overridden with a Visualforce page

Standard buttons that are not available for overrides can still be hidden on page layouts

Standard buttons can be overridden, relocated on the detail page, and relabeled

Question 4

The Service Manager provided the app builder with color code requirements for case age on open cases. New cases populate a green circle Day-old cases populate a yellow circle Three-day-old cases populate a red circle How should an app builder implement this requirement?

Formula Field

Quick Action

Custom Button

Lightning Web Component

Question 5

At Universal Containers, the Account object has a Master-Detail relationship with an Invoice custom object. The App Builder would like to change to a lookup field, but is not able to do so. What could be causing this?

The invoice must have at least one Master-Detail field for reporting.

The Account record includes Invoice roll-up summary fields.

The Invoice records have existing values in the Account.

The Account is included in the workflow on the Invoice object.

The Account record includes Invoice roll-up summary fields. This is correct because roll-up summary fields are only available on the master object in a master-detail relationship, and changing the field type to lookup would delete the roll-up summary fields