1. SAP Help Portal - SAP SuccessFactors People Analytics: In the guide "Implementing and Managing Analytics in SAP SuccessFactors," the section on "Filtering Data in a Query" details the different filter types. It explains that filters can be applied at the query level or the table level. A query-level filter is necessary to access fields across all joined tables, and the "Advanced" option provides the calculation editor to build the multi-table expression. (Reference: SAP Help Portal, Implementing and Managing Analytics in SAP SuccessFactors, Section: Building a Query -> Filtering Data in a Query).
2. SAP Learning Hub - THR92 Courseware: The official THR92 course materials, "SAP SuccessFactors People Analytics: Reporting," explain the functionality of the Query Designer. Unit 4, "Creating Stories," demonstrates that to filter the combined result of a query, a filter must be applied at the query level. The lesson on advanced filtering explicitly shows how to use the calculation editor to reference columns from different objects (tables) in the query schema. (Reference: SAP Learning Hub, Course THR92, SAP SuccessFactors People Analytics: Reporting, Unit 4, Lesson: Advanced Filtering in Queries).