Conquering the D365FO Interview: A Comprehensive Guide to Acing Technical Questions

In the ever-evolving world of Enterprise Resource Planning (ERP) solutions, Microsoft Dynamics 365 Finance and Operations (D365FO) has emerged as a powerful and versatile platform. As businesses increasingly adopt this cloud-based system, the demand for skilled D365FO technical consultants continues to rise. If you’re preparing for an interview in this domain, you’ll want to be well-versed in the technical intricacies of the platform.

This comprehensive guide will equip you with a deep understanding of the most commonly asked D365FO interview questions, along with insightful answers to help you navigate the interview process with confidence.

Understanding D365FO and Its Core Concepts

Before delving into the interview questions, it’s essential to grasp the fundamentals of D365FO and its underlying concepts.

What is Dynamics 365 F&O?

Microsoft Dynamics 365 Finance and Operations (D365FO) is a cloud-based Enterprise Resource Planning (ERP) platform developed by Microsoft. It has replaced the previous on-premises version, Dynamics AX 2012, offering a modern and scalable solution for businesses.

What are OOPS concepts?

Object-Oriented Programming (OOP) concepts play a crucial role in D365FO development. The main OOP concepts used in D365FO include:

• Class and Objects: Basic building blocks of OOP.
• Data Abstraction: Showing only essential information and hiding background details.
• Encapsulation: Wrapping data members and methods into a single unit.
• Inheritance: The flow of properties from a parent class to a child class.
• Polymorphism: The ability to use the same method for different purposes.

What is AOT in D365FO?

The Application Object Tree (AOT) is a tree view that displays all the application objects in Microsoft Dynamics D365FO. It contains every object needed to customize the look and functionality of a D365FO application.

Interfaces & Abstract Classes

• Interfaces define the signature for a particular method, without any implementation details. They cannot contain constructors, fields, or destructors.
• Abstract Classes contain both incomplete and complete methods, as well as constructors, fields, and destructors for implementing properties. Unlike interfaces, abstract classes do not support multiple inheritances.

What is the concept of extension in D365?

An extension is a way to add new functionality to an existing object in D365FO without modifying the base code. Microsoft introduced this concept to make it easier to upgrade the application code base in the future.

Diving into Technical Interview Questions

Now that you have a solid understanding of the fundamental concepts, let’s explore some of the most commonly asked D365FO technical interview questions and their corresponding answers.

1. What are the different types of Tables used in D365FO?

In D365FO, there are three types of tables:

• Regular Tables: Persistent tables that store data in the database.
• TempDB Tables: Temporary tables that store data in the tempdb database, which is cleared when the server is restarted.
• InMemory Tables: Non-persistent tables that store data in memory, which is lost when the session ends.

1. What is the difference between TempDB and InMemory Tables?

The primary difference between TempDB and InMemory Tables lies in their storage and persistence:

• TempDB Tables store data in the tempdb database, which is cleared when the server is restarted but persists across sessions.
• InMemory Tables store data in memory, which is lost when the session ends, making them non-persistent.

1. What is EDT and Base Enum?

• EDT (Extended Data Type): EDTs are data types created and managed in the development environment. They can be primitive data types like integers, strings, real numbers, and booleans, with additional properties added to extend their original properties.
• Base Enum: Base Enumerations (Enums) are a fixed set of values, typically stored as integers in the database but with associated names and labels for reference in X++ code. Base Enums can have up to 255 values, ranging from 0 to 254.

1. What is an index in D365FO?

An index is a table-specific database structure that speeds up the retrieval of rows from a table. Indexes are used to improve data retrieval performance and ensure the existence of unique records. There are two types of indexes:

• Unique Indexes: Ensure that no duplicate key values occur in the table.
• Non-unique Indexes: Allow duplicate key values in the table.

1. What are Delete Actions in D365FO?

Delete Actions define the behavior of related records when a record is deleted from a table. The various Delete Actions in D365FO include:

• Cascade: Deletes all related records in the referenced table.
• RemoveFriendly: Sets the related records to their default values.
• Restrict: Prevents deletion if related records exist.
• RemoveDirty: Removes related records without validating constraints.

1. What is the difference between RunBase and RunBaseBatch classes?

• RunBase: This class is used for interactive tasks that require user interaction or input.
• RunBaseBatch: This class is used for batch jobs or background processes that run without user interaction.

1. What are Table Relations in D365FO?

Table relations associate two tables that contain related information. The primary key field of one table (parent table) appears as a foreign key field in the related table (child table). The different types of table relations in D365FO include:

• Normal Relation: Specifies related fields in another table without any conditions.
• Field Fixed Relation: Restricts records in the primary table based on a condition, typically involving an Enum.
• Related Field Fixed Relation: Restricts records in the related table based on a condition, typically involving an Enum.
• Foreign Key Relation: Specifies a correspondence between a foreign key field in the present table and the primary key field in another parent table.

1. What are the different types of Menu Items available in D365FO?

D365FO provides three types of menu items:

• Display Menu Item: Opens a form.
• Output Menu Item: Opens an SSRS (SQL Server Reporting Services) report.
• Action Menu Item: Runs a batch job or another process, such as a class.

1. What is CoC (Chain of Command)?

Chain of Command (CoC) enables strongly typed extension capabilities for public and protected methods. It is a development capability that allows technical consultants to extend the application without overlayering. Microsoft has implemented CoC across Classes, Tables, Forms, form data sources, and data field methods.

1. What is an SSRS Report in D365FO?

SQL Server Reporting Services (SSRS) is a server-based report generating software system developed by Microsoft. It allows businesses to build custom reports from various data sources, such as SQL databases and external sources. SSRS reports can be shared with users based on access permissions and user groups.

By familiarizing yourself with these technical questions and their respective answers, you’ll be well-prepared to showcase your expertise during the D365FO interview process. Remember, the key to success lies in providing specific examples, demonstrating your problem-solving abilities, and showcasing your commitment to delivering high-quality solutions.