SAP BOXED COMPONENTS documentation, setup help and usage info

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Boxed Component s
Boxed component s are structures that are not saved in the higher-level context itself. Instead, an internal reference that points to the actual structure is stored in place of the structure. A boxed component is always a deep component of its context.
It is currently to possible to declare substructures of data types and structured attributes of classes as

static boxes

that support initial value sharing .

Notes

Boxed component s are a halfway house between static and dynamic data objects . Their memory requirement has not already been defined when the program is started in internal mode, but they can be treated like static data objects with a fixed length.

A nested structure that contains a boxed component as a component is always a deep stucture .

Structures of ABAP Dictionary can also contain boxed component s. ABAP Dictionary database tables cannot contain any boxed component

s as their structures have to be flat.

In the classes and objects of the RTTS , boxed component s are handled as follows:

The class CL_ABAP_TYPEDESCR contains the constant TYPEKIND_BREF for static boxes. The value of these constants is listed as the type of a static box in the component table COMPONENTS of class

CL_ABAP_STRUCTDESCR or attribute table ATTRIBUTES of classes CL_ABAP_CLASSDESCR or CL_ABAP_INTFDESCR .

In the return code of the method GET_COMPONENTS of class CL_ABAP_STRUCTDESCR or

GET_ATTRIBUTE_TYPE of classes
CL_ABAP_CLASSDESCR or
CL_ABAP_INTFDESCR , boxed component s such as reference variables are listed as type description objects of class CL_ABAP_REFDESCR . The method
GET_REFERENCED_TYPE of this class gets a type description object for the substructure. A type description object of the class
CL_ABAP_REFDESCR , which describes a boxed component , cannot be used in the statements CREATE DATA or ASSIGN CASTING .

SAP BOXED COMPONENTS documentation, setup help and example usage