other_repo_name = _form['other_repo']

        other_ref = _form['other_ref'] # will have symbolic name and head revision

        other_repo = RepoModel()._get_repo(other_repo_name)

        (other_ref_type,

         other_ref_name,

         other_rev) = other_ref.split(':')

        cs_ranges, _cs_ranges_not, ancestor_rev = \

            CompareController._get_changesets(org_repo.scm_instance.alias,

                                              other_repo.scm_instance, other_rev, # org and other "swapped"

                                              org_repo.scm_instance, org_rev,

                                              )

        revisions = [cs.raw_id for cs in cs_ranges]

        # hack: ancestor_rev is not an other_rev but we want to show the

        # requested destination and have the exact ancestor

        other_ref = '%s:%s:%s' % (other_ref_type, other_ref_name, ancestor_rev)

        reviewers = _form['review_members']

        title = _form['pullrequest_title']

        if not title:

            if org_repo_name == other_repo_name:

                title = '%s to %s' % (h.short_ref(org_ref_type, org_ref_name),