Exporting workflow error: Substream Source(EntitySource) cannot be materialized more than once Completed
Exporting a workflow from the Broad Methods Repository to a workspace can occasionally result in the following error.
Error: Substream Source(EntitySource) cannot be materialized more than once
Our engineers are currently investigating this issue and working on a fix. As a workaround, if your workflow of interest is already in a Terra workspace, you can copy that workflow from the Workflows tab to the target workspace.

Retrying the export multiple times has also been reported to work.
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This issue is fixed as of January 25, 2021.
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