diff --git a/src/server/BreCal/validators/input_validation_utils.py b/src/server/BreCal/validators/input_validation_utils.py
index a78a75a..e68f18e 100644
--- a/src/server/BreCal/validators/input_validation_utils.py
+++ b/src/server/BreCal/validators/input_validation_utils.py
@@ -20,7 +20,8 @@ def get_participant_id_dictionary():
 
     # build a dictionary of id:item pairs, so one can select the respective participant
     participants = json.loads(response)
-    participants = {items.get("id"):items for items in participants}
+    participants = {items.get("id"):{**items, "participant_id":items.get("id")} for items in participants}
+    assert all(["participant_id" in participant for k,participant in participants.items()])
     return participants
 
 def get_berth_id_dictionary():