Loading and clearing/replacing data via Data Management

Summary

Loading data via Data Management where the intersections requiring data clear/replace vary

Content

We have a process where we load data from an external system into Planning via Data Management, focused around two of our dimensions - Client (custom dimension) and Entity (standard Entity dimension). During this process, we do not know which Client and Entity intersections will be imported and which will not. We do not want to clear previously existing Client data (prior to loading) that has not been imported, so a business rule doesn't really solve this for us, as it would not dynamically know what to clear.