Answer
Confirm the actual IAL Owner account configured in your environment — check the 'Default IAL Owner' System Parameter (commonly IFSINFO, but this can vary) — and make sure the IAL view name referenced in the Aurena data source element is correctly qualified/aliased to match that exact IAL Owner account. A mismatch between the IAL Owner assumed when building the data source and the actual configured IAL Owner is a specific, confirmed cause of this 'Invalid data source definition' error appearing only in Aurena.