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ABENDDIC_STRUCTURES_TECH - DDIC STRUCTURES TECH

ABENDDIC_STRUCTURES_TECH - DDIC STRUCTURES TECH

General Data in Customer Master   ABAP Short Reference  
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- Technical Attributes of Structures

A DDIC structure describes a structure type constructed from components and with the following technical attributes:

  • Component name
The name of a component can have a maximum of 30 characters, can consist of only letters, numbers, and underscores, and must start with a letter or a namespace prefix. The following restrictions apply:
  • A component name cannot be the name of the pseudo component table_line reserved in ABAP.

  • If a structure is to be included in a database table, however, the component names cannot have any of the reserved names that are forbidden in DDIC database tables.

  • Component type

  • For reference-like components, the technical attributes are defined using a reference to a data element that describes a reference type or defined directly in the structure component. When specified directly, data references can be defined by reference to any DDIC data type or to the generic type DATA. Object references can be defined by reference to classes or interfaces in the class library or to the generic type OBJECT,

  • Enhancement category
The enhancement category of a structure specifies how a structure can be enhanced using customizing includes or append structures and affects how ABAP programs that work with data objects of this structure type are checked.
  • Activation type
An activation type can be defined for a structure, like for DDIC database tables, but has no specific use here.

Notes

  • In ABAP, the component names of structures are not strictly speaking a technical type attribute. They are listed here however to simplify the picture.
  • The above rules for component names are checked strictly by the ABAP Dictionary only for table fields of DDIC database tables and not for structures. Component names of structures can contain special characters such as a colon : that prevent the component from being addressed in an ABAP program. For this reason, only those component names should be used that comply with the above rules.






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