Hello, we would need a documentation for HCM that identifies how the different subject areas are linked to each other in FDI. It would be something similar to the documentation for ERP 25R1_ERP_Bus_Matrix.xlsx.
Welcome to the Oracle Analytics community, @Ivancho! I am adding additional context on what you are referring to for the benefit of others reading this idea: The ERP Matrix (ERP 2XRX_ERP_Bus_Matrix.xlsx) referenced can be found here in the Report Authoring Tips in the Reference for Fusion ERP Analytics Documentation under the Bus Matrix heading.
This idea is requesting a similar guide in to be provided in the HCM Analytics Documentation Report Authoring Tips section (here).