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ABAP - Keyword Documentation → ABAP - Dictionary → ABAP CDS in ABAP Dictionary → ABAP CDS - Syntax →ABAP CDS - Annotations
An annotation enriches a definition in the ABAP CDS with metadata. It can be specified for specific scopes of a CDS object, namely specific places in a piece of CDS source code. SAP uses a set of predefined SAP annotations.
Note
Customers and partners are currently not advised to defined their own annotations and use only SAP annotations instead.