Changing underlying data
You can change the underlying relationship used to process a semantic model after it has been created. When you make changes, those changes are reflected in the semantic model causing it to be revalidated.
To change the underlying data, perform the following steps.
From the Toolbox, click Semantic Models.
Select a semantic model and make sure the Define Semantics tab is selected.
In the Source panel of the Properties pane, click Open Source.
The Relationship opens in a separate tab. You can view or make changes to it, then click the original tab to return to where you were working.