diff --git a/process/supplier-agent/lib/create-reactions.ts b/process/supplier-agent/lib/create-reactions.ts
index 67be332..30bffa0 100644
--- a/process/supplier-agent/lib/create-reactions.ts
+++ b/process/supplier-agent/lib/create-reactions.ts
@@ -113,12 +113,21 @@ export function fillAgentRewardSummReaction(
           });
 
           $calculation.element(rewardSummField).setValue(evo_reward_condition?.evo_reward_summ);
-
-          $calculation.element(rewardSummField).unblock();
         }
       ),
     () => $process.has('LoadKP')
   );
+
+  reaction(
+    () => $calculation.element(rewardConditionField).getValue(),
+    (rewardConditionId) => {
+      if (!rewardConditionId) {
+        $calculation.element(rewardSummField).block();
+      } else {
+        $calculation.element(rewardSummField).unblock();
+      }
+    }
+  );
 }
 
 const QUERY_GET_REWARD_CONDITION = gql`