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ABAP_DDIC - Domains A DDIC domain is a standalone dictionary object that defines technical and semantic properties of elementary data types. Data elements can be defined with reference to a domain and inherit the properties defined there. Domains can only be used in DDIC data elements. A domain can be used by any number of data elements.
Technical properties of domains
Semantic properties of domains The name of a domain must follow the naming rules for DDIC data types but it is located in a different namespace from data types. A domain can have the exact same name as a data type and, more particularly, a data element.
Latest notes:
Redundant domains should not occur within an application component or a package. Domains that only have technical properties should be created as reusable domains in central basis packages. One example is the domain CHAR255.
The fixed values of a domain can be used as special kinds of literals in ABAP_CDS_V1_VIEWS .
A domain determines properties of an elementary data type but is not a data type itself. A domain cannot be specified after a TYPE addition in ABAP. NON_V5_HINTS
Domains can be maintained in form-based tools both in the ABAP Dictionary tool and in the ABAP Development Tools (ADT). ABAP_HINT_END
