What are standard datatypes and extended data types in D365FO?

Microsoft Dynamics 365 Finance and Operations (D365FO), the standard datatypes and extended data types are critical for defining how data is stored, processed, and displayed within the system.

Standard Data Types:

These are the basic types provided by the X++ language in D365FO, similar to common programming languages. Some of the most commonly used standard data types include:

1. Integer (int): Represents whole numbers.
2. Real: Represents floating-point numbers.
3. Boolean: Represents true or false values.
4. Date: Represents calendar dates.
5. Time: Represents time of day.
6. DateTime: Represents a combination of date and time.
7. String: Represents a sequence of characters or text.
8. Enum: Represents an enumerated list of named constants.

Extended Data Types (EDTs):

Extended Data Types are user-defined types that extend the standard data types. They provide additional metadata, such as labels, help texts, and formatting, and can be reused across multiple tables, fields, and variables. EDTs add an abstraction layer over the base data types, making it easier to manage and maintain data integrity.

• Usage: EDTs are used to define fields in tables, forms, reports, and queries. For example, an EDT named AccountNum might extend the String type but with additional constraints or formatting applied.

• Custom Properties: EDTs can have properties like StringSize, Label, and HelpText to enhance the usability and consistency of data entry across the system.

• Extension: EDTs can also be extended, allowing developers to modify properties like labels, string sizes, or help texts without modifying the original type. This is particularly useful in keeping customizations upgrade-safe.