SAP NetWeaver AS ABAP Release 750, ©Copyright 2016 SAP AG. All rights reserved.ABAP - Keyword Documentation → ABAP - Dictionary → Classic Objects in ABAP Dictionary → Data Types →
A data element in ABAP Dictionary defines an elementary data type or a reference type and describes, alongside the technical type attributes, the semantic meaning of an object defined with reference to the data element. Data elements are the elementary parts of complex types such as structures, table types, or database tables. An internal program object declared with reference to a data element always has one of the elementary predefined ABAP types. The type in question is defined by the mapping of the predefined types in ABAP Dictionary to ABAP types.
The technical attributes of a data elements can be described either directly or by using a reusable domain. This is why the concept is known as a two-level domain concept.