I'm using the following tutorial to define a workflow on a SharePoint list to create an element in and external List.
When the workflow action tries to create the item in the external list, it fails with this message:
The workflow could not update the item in the external data source. Make sure the user has permissions to access the external data source and update items.
I found the following in the logs:
The security configuration of the LobSystemInstance does not permit running a workflow activity. Use Secure Store credentials for this LobSystemInstance to enable this scenario.
I'm an administrator, and I've set up full control for me on the Sharepoint list and on the external list.
(the bottom of the tutorial has a comment with the same error message, but no response).
Where can I setup the extra security that the error message is asking for?