https://help.sap.com/viewer/6811c09434084fd1bc4f40e66913ce11/201809.000/en-US/34dfb3083df34453beb5eb8ade7bd4ed.html
Using Hierarchy in CDS
https://wiki.scn.sap.com/wiki/display/BI/Using+Hierarchy+in+CDS
ODATA Query: Hierarchy Handling
- ODATA Query: Hierarchy Handling: BW Query 中的 Hierarchy 在生成的 OData Service 的体现形式
Hierarchies in CDS views
https://blogs.sap.com/2016/11/25/hierarchies-in-cds-views/
How to build a Custom Hierarchy in ABAP CDS views
https://blogs.sap.com/2017/02/22/how-to-build-a-custom-hierarchy-in-abap-cds-views/
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