This item has been identified as an outstanding known issue and a workaround is provided.
When attempting to edit the Import Data Source of a Model-to-Model import, in a model which has been moved to a different workspace, the error below is received:
"API invocation failed: Illegal argument"
To work around this issue, follow the steps below:
Ignore the message and re-select the new source
Recreate the import action
Use model mapping (Model Settings > Source Models)
Note: This workaround will not resolve the error, but will allow you to run the import.
If this workaround is not suitable in your use case, please contact Support at firstname.lastname@example.org.
Internal Reference: CORESRV-765