What are Enums in Business Central AL?

In Microsoft Dynamics 365 Business Central, an Enum is a strongly typed data type that represents a predefined set of valid values.

For example, an order status could conceptually be:

Open
Released
Completed
Cancelled

Instead of storing arbitrary text values, an Enum ensures that the application works with a controlled set of options.

A simplified AL example:

enum 50100 "Order Status"
{
    Extensible = true;

    value(0; Open)
    {
        Caption = 'Open';
    }

    value(1; Released)
    {
        Caption = 'Released';
    }

    value(2; Completed)
    {
        Caption = 'Completed';
    }
}

Enums can then be used as fields in tables and referenced in business logic, pages, APIs, and extensions.

Expert perspective

One important advantage of modern Business Central Enums is extensibility. An Enum can be designed as extensible, allowing other extensions to add values without modifying the original object.

This makes Enums preferable to hard-coded option-style implementations when building maintainable and extensible Business Central solutions.

Developers should also consider how Enum values behave across integrations and extensions rather than treating them simply as dropdown lists.