diff --git a/awx/api/views/__init__.py b/awx/api/views/__init__.py
index 663c3892a9..d566dfd477 100644
--- a/awx/api/views/__init__.py
+++ b/awx/api/views/__init__.py
@@ -2957,6 +2957,8 @@ class WorkflowJobTemplateNodeChildrenBaseList(WorkflowsEnforcementMixin, Enforce
         if parent.id == sub.id:
             return {"Error": _("Cycle detected.")}
 
+        if parent.id == sub.id
+
         if WorkflowJobTemplateNode.objects.filter(Q(pk=parent.id) &
                                                   Q(success_nodes__in=[sub.id]) |
                                                   Q(failure_nodes__in=[sub.id]) |
diff --git a/awx/main/tests/functional/api/test_workflow_node.py b/awx/main/tests/functional/api/test_workflow_node.py
index d902d3546b..003beea9bf 100644
--- a/awx/main/tests/functional/api/test_workflow_node.py
+++ b/awx/main/tests/functional/api/test_workflow_node.py
@@ -110,6 +110,17 @@ class TestExclusivePathEnforcement():
             if index != 0:
                 assert {'Error': 'Relationship not allowed.'} == json.loads(r.content)
 
+    @pytest.mark.parametrize("relationship", ['success', 'failure', 'always']):
+    def test_existing_relationship_allowed(self, post, admin_user, n1, n2, relationship):
+        r = post(self.generate_url(path, n1.id),
+                 data={'associate': True, 'id': n2.id},
+                 user=admin_user,
+                 expect=204)
+        r = post(self.generate_url(path, n1.id),
+                 data={'associate': True, 'id': n2.id},
+                 user=admin_user,
+                 expect=200)
+
 
 @pytest.mark.django_db
 class TestNodeCredentials: