To receive e-mails about errors, this needs to be set up in the B2B Backbone app.
ErrosErrors:
External Document No. exists already
...
The order is loaded, but an e-mail is sent about the error.
Errors, when set up in job queue
If exchange of documents is set up in job queue, as described under Job Queue Setup, there will not be shown errors in BC continously, but correct orders will be loaded, and e-mail with error message will be sent for each order.