diff --git a/tracdap-api/tracdap-metadata/src/main/proto/tracdap/metadata/job.proto b/tracdap-api/tracdap-metadata/src/main/proto/tracdap/metadata/job.proto
index d364ce36b..9f7761b4f 100644
--- a/tracdap-api/tracdap-metadata/src/main/proto/tracdap/metadata/job.proto
+++ b/tracdap-api/tracdap-metadata/src/main/proto/tracdap/metadata/job.proto
@@ -197,7 +197,7 @@ message ExportDataJob {
  * Specify the group type for a JOB_GROUP job
  */
 enum JobGroupType {
-  EMPTY_JOB_GROUP = 0;
+  JOB_GROUP_TYPE_NOT_SET = 0;
   SEQUENTIAL_JOB_GROUP = 1;
   PARALLEL_JOB_GROUP = 2;
 }
diff --git a/tracdap-runtime/python/src/tracdap/rt/_exec/dev_mode.py b/tracdap-runtime/python/src/tracdap/rt/_exec/dev_mode.py
index 7c6cadba3..94a8cb8d9 100644
--- a/tracdap-runtime/python/src/tracdap/rt/_exec/dev_mode.py
+++ b/tracdap-runtime/python/src/tracdap/rt/_exec/dev_mode.py
@@ -199,7 +199,7 @@ def translate_job_group(
 
         job_group = job_def.jobGroup
 
-        if job_group.jobGroupType is None or job_group.jobGroupType == _meta.JobGroupType.EMPTY_JOB_GROUP:
+        if job_group.jobGroupType is None or job_group.jobGroupType == _meta.JobGroupType.JOB_GROUP_TYPE_NOT_SET:
             job_group = self._process_job_group_type(job_group)
 
         group_details = self._get_job_group_detail(job_group)
diff --git a/tracdap-runtime/python/src/tracdap/rt/_exec/functions.py b/tracdap-runtime/python/src/tracdap/rt/_exec/functions.py
index 132ff23a8..17ee04790 100644
--- a/tracdap-runtime/python/src/tracdap/rt/_exec/functions.py
+++ b/tracdap-runtime/python/src/tracdap/rt/_exec/functions.py
@@ -715,7 +715,7 @@ def __init__(self, node: ChildJobNode):
 
     def _execute(self, ctx: NodeContext):
         # This node should never execute, the engine intercepts child job nodes and provides special handling
-        raise _ex.ETracInternal("Child job was not processed correctly(this is a bug)")
+        raise _ex.ETracInternal("Child job was not processed correctly (this is a bug)")
 
 
 
diff --git a/tracdap-runtime/python/src/tracdap/rt/_exec/graph.py b/tracdap-runtime/python/src/tracdap/rt/_exec/graph.py
index d01ac24d6..0d008d895 100644
--- a/tracdap-runtime/python/src/tracdap/rt/_exec/graph.py
+++ b/tracdap-runtime/python/src/tracdap/rt/_exec/graph.py
@@ -20,6 +20,7 @@
 import tracdap.rt.metadata as meta
 import tracdap.rt.config as cfg
 
+
 _T = tp.TypeVar('_T')