An issue does not get synchronized and appears in the troubleshooting section with the category 'Outgoing Issue error' and a message explaining more details about this error.
An error happened while Backbone tried to export changes for this issue to the partner instance.
Unfortunately we have not seen this error code so far, so we cannot provide a solution here. If you get this error, contact our support team, who will analyze the support ticket and help you resolve the problem:
- Create a support zip as described in Analyze and fix errors
- Contact our support and attach the support zip in the ticket