SourceDataDir
The SourceDataDir is the root folder for (temporary) source files/databases used in your project. The data in this folder (and subfolders) is usually read-only.
You can adjust the path on your local machine for the SourceDataDir from the GeoDMS GUI with the menu option: Tools > Options > Advanced Tab.
In your configuration you can use the placeholder %SourceDataDir% to refer to this folder.
