ABAP Dictionary is a persistent repository of type definitions (meta data) on AS ABAP visible in all repository objects, particularly in ABAP programs, and usable as part of the package concept. As in the ABAP language, the definable data types in ABAP Dictionary can be elementary, structured, or tabular. The structures in ABAP Dictionary have the important task of describing database tables and views in the database, while also being visible in all other repository objects. This makes it possible to define type-appropriate interface parameters and data objects for handling database tables. Alongside the data types (and others), lock objects and search helps are also managed in ABAP Dictionary. All objects (definitions) in ABAP Dictionary are themselves transportable repository objects.
The objects managed by ABAP Dictionary are divided into two classes:
The elementary components of all objects in ABAP Dictionary are based on a set of predefined data types in ABAP Dictionary.
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