When combining information from different tables, you want to be able to calculate ratios based on measures that are based on different aggregation levels. For example the number of cases per purchasing organization divided by the number of FTE's for each purchasing organization (to get to the productivity per FTE per Purchasing Organization). The number of FTE's can come from an enhancement table for example.
This capability is now available from SR27 as enhanced scripted definitions. Please find the detailed documentation below https://docs.aris.com/10.0.27.0/ypm-apm/en/#/home/492378/en/1