Hi Jeff, Thanks very much for your fast response. I agree that re-sourcing should be straightforward... but it doesn't work for me as you have it scripted above. I can run the equivalent of your script within an ArcGIS Pro session and, despite running for a period of time, the data sources remain unchanged. Likewise, I can run the script in a standalone Python shell that saves a copy of the 'updated' APRX with the same non-results. I assume this is related to BUG-000112574, so was hoping to use the 'Alternate Solution' proposed on that page of two dictionaries, but there is no clear direction on how to do this. Are you able to confirm that your script runs in ArcGIS Pro 2.5.2? If not, can you advise on the appropriate dictionary syntax to use to achieve the required outcome? Thanks again, your assistance is much appreciated.
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