BDEF alternative key

A user-defined BDEF key. User-defined BDEF keys exist in addition to the primary key of the underlying CDS data model and to the predefined secondary table keys for BDEF derived types. There are two types of BDEF alternative keys:

• BDEF pure key
• BDEF secondary key

BDEF alternative keys are used, for example, to define the signature of a RAP key function.

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