What ABAP Dictionary object allows you to define fixed values?

The ABAP Dictionary object that allows you to define fixed values is the domain. A domain in ABAP Dictionary serves the purpose of defining the technical attributes of a field and can include a set of fixed values associated with it. These fixed values can be used to constrain the values that can be entered for fields that are based on that domain, ensuring data integrity and consistency across the application.

Domains not only define the data type and length but also encapsulate the permissible values, which can be predefined values or fixed values defined in a value table. This offers the benefit of maintaining a central data integrity point, allowing the same set of fixed values to be reused across multiple fields that utilize that domain.

In contrast, a view serves to present data from one or more database tables but does not define any fixed values. A data element provides a name and description for a field but does not itself define fixed values; it refers to a domain for its data type. A lock object is entirely different as it is used for managing concurrency control to prevent multiple users from modifying the same data simultaneously, which is unrelated to defining fixed values.