diff --git a/daliuge-engine/dlg/manager/session.py b/daliuge-engine/dlg/manager/session.py
index 2ea5e307a..58debcfea 100644
--- a/daliuge-engine/dlg/manager/session.py
+++ b/daliuge-engine/dlg/manager/session.py
@@ -102,7 +102,9 @@ def handleEvent(self, evt):
         )
         if self._completed == self._nexpected:
             logger.debug("Building Reproducibility BlockDAG")
-            init_runtime_repro_data(self._session._graph, self._session._graphreprodata)
+            self._session.graphreprodata = \
+            init_runtime_repro_data(self._session._graph, self._session._graphreprodata)[
+                "reprodata"]
             self._session.reprostatus = True
             self._session.write_reprodata()
 
@@ -322,7 +324,7 @@ def deploy(self, completedDrops=[], event_listeners=[], foreach=None):
         # in reality this particular session is managing nothing
         status = self.status
         if (self._graph and status != SessionStates.BUILDING) or (
-            not self._graph and status != SessionStates.PRISTINE
+                not self._graph and status != SessionStates.PRISTINE
         ):
             raise InvalidSessionState(
                 "Can't deploy this session in its current status: %d" % (status)
@@ -492,7 +494,7 @@ def add_node_subscriptions(self, relationships):
 
                 # We are in the event receiver side
                 if (rel.rel in evt_consumer and rel.lhs is local_uid) or (
-                    rel.rel in evt_producer and rel.rhs is local_uid
+                        rel.rel in evt_producer and rel.rhs is local_uid
                 ):
                     dropsubs[remote_uid].add(local_uid)
 
@@ -515,7 +517,7 @@ def append_reprodata(self, oid, reprodata):
             if self._graph[oid].get("reprodata") is None:
                 return
             if self._graph[oid]["reprodata"]["rmode"] == str(
-                ReproducibilityFlags.ALL.value
+                    ReproducibilityFlags.ALL.value
             ):
                 drop_reprodata = reprodata.get("data", {})
                 drop_hashes = reprodata.get("merkleroot", {})
@@ -557,9 +559,9 @@ def end(self):
 
     def getGraphStatus(self):
         if self.status not in (
-            SessionStates.RUNNING,
-            SessionStates.FINISHED,
-            SessionStates.CANCELLED,
+                SessionStates.RUNNING,
+                SessionStates.FINISHED,
+                SessionStates.CANCELLED,
         ):
             raise InvalidSessionState(
                 "The session is currently not running, cannot get graph status"
@@ -594,9 +596,9 @@ def cancel(self):
                 dsDrop for dsDrop in downStreamDrops if isinstance(dsDrop, AbstractDROP)
             ]
             if drop.status not in (
-                DROPStates.ERROR,
-                DROPStates.COMPLETED,
-                DROPStates.CANCELLED,
+                    DROPStates.ERROR,
+                    DROPStates.COMPLETED,
+                    DROPStates.CANCELLED,
             ):
                 drop.cancel()
         self.status = SessionStates.CANCELLED