ABAP Keyword Documentation →  ABAP − Reference →  Built-In Types, Data Objects, Functions, and Constructors 

Built-In Data Objects

ABAP programs have access to a range of predefined (built-in) data objects:

• ABAP system fields

• The constant space

• The self reference me

The obsolete built-in structure screen also exists.

Other versions: 7.31 | 7.40 | 7.54

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ABAP System Fields

The Constant space

The Self-Reference me