diff --git a/backend/categorisation/processor.py b/backend/categorisation/processor.py
index fd0d9c89..ca58fb9d 100644
--- a/backend/categorisation/processor.py
+++ b/backend/categorisation/processor.py
@@ -79,9 +79,9 @@ def choose_cheapest_relevant_plan(
         if (plan.record.cost_of_works or float("inf")) == min_cost
     ]
 
-    for priority_plan_id in scenario_priority_order:
+    for priority_scenario_id in scenario_priority_order:
         for plan in cheapest_plans:
-            if plan.id == priority_plan_id:
+            if plan.scenario.id == priority_scenario_id:
                 return plan
 
     return cheapest_plans[0]