IOBJ in CDS

Similar to BW, InfoObject in CDS could be:

Key figures / measures:
Fields defined with annotation @DefaultAggregation: #SUM or #MIN or #MAX. Usually they are directly defined in a "@Analytics.dataCategory: #CUBE" CDS views.
If it is defined in a "@Analytics.dataCategory: #DIMENSION" CDS views, it is a key figure attribute of the InfoObject.
By using @Aggregation.default: #NOP, key figure can have default aggregation NO2.
Characteristics:
All other fields, either without @DefaultAggregation annotation, or with @DefaultAggregation:#NONE.
If the data type of the field is a key figure type, such as CURR, QUAN, DEC, FLTP..., it is not supported for a characteristic. In this case, the field is simply ignored.
Long timestamp (data type TIMESTAMPL) field is not supported. The field is ignored. (Note 2737769)

Features:

Only support DefaultAggregation: SUM, MIN, MAX, NOP.
To use other aggregation such as AVG, please use formula exception aggregation in a CDS query.
Semantics needs to be defined for amount or quantity key figures
In a CDS query, key figure can't be used in CASE statement when clause as a condition. Because filtering on a key figure is not supported in Analytic Engine. Please use a formula with IF clause instead.

Examples:

Default Aggregation in CDS