Create OData V2 in SEGW with Aggregation Annotation on Entity Type

[szelbi]

Hello,

I would like to create an OData V2 using SEGW so that I can populate the output data using ABAP code. At the same time, I would like to use this output to create a KPI using the "Manage KPIs and Reports" Fiori app. However, as it is described in the SAP KBA 2595272, it must have data aggregation enabled (sap:semantics="aggregate" in the Entity Type metadata).

In CDS I would be able to do this using annotations as described here: OData V2 Interpretation of Aggregation Annotations. However, in the sample CDS that allows you to create a KPI (C_EWM_WarehouseTaskQ_2), there is no such annotation. I assume that since it is an analytics query, it might be enough to automatically create these annotations in the metadata. Am I right?

In OData V2 created with SEGW, I was able to find that you can add annotations after selecting the Generation Strategy "2 Service with Vocabulary-Based Annotations". However, these annotations are quite different from what can be found in the CDS views. Therefore, I am struggling trying to find a solution to the problem described above, how to add the aggregation to an Entity Type and thanks to this be able to select the related Entity Set for KPI creation. I was able to find some documentation describing the Vocabularies available in SEGW, but I couldn't get it to work: OData Vocabularies 

Could you please help me to configure these annotations? Thanks in advance.