- From the Import step within a workflow and click “Retransform”…the Import chevron will turn green

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Then, you can Validate then Load the stage data (which technically is blank) and it should clear the residual data in the cube for that Workflow POV (Scenario/Time).
Note: Be sure to run a consolidation process to be sure it clears the appropriate parent level data.
Source: Office Hours 2020-10-22 Partner Enablement