Resolve relationship ids in the "from" document (which will have been in a draft locale) and in the "draft" document (where we are exporting to) to point to a consistent locale, so that the diff applies properly
function resolveToSource(callback) {
          return async.series([
            _.partial(self.resolveRelationships, req, draft, to.workflowLocale),
            _.partial(self.resolveRelationships, req, from, to.workflowLocale)
          ], callback);
        }