diff --git a/backend/src/main/java/com/edufocus/edufocus/qna/entity/Qna.java b/backend/src/main/java/com/edufocus/edufocus/qna/entity/Qna.java
index 2325ae2..6216f88 100644
--- a/backend/src/main/java/com/edufocus/edufocus/qna/entity/Qna.java
+++ b/backend/src/main/java/com/edufocus/edufocus/qna/entity/Qna.java
@@ -54,6 +54,7 @@ public class Qna {
 
     @ManyToOne
     @JoinColumn(name = "lecture_id")
+    @OnDelete(action = OnDeleteAction.CASCADE)
     private Lecture lecture;
 
     private boolean isMine;
diff --git a/backend/src/main/java/com/edufocus/edufocus/report/entity/vo/ReportSet.java b/backend/src/main/java/com/edufocus/edufocus/report/entity/vo/ReportSet.java
index 1fd87e1..b0a245b 100644
--- a/backend/src/main/java/com/edufocus/edufocus/report/entity/vo/ReportSet.java
+++ b/backend/src/main/java/com/edufocus/edufocus/report/entity/vo/ReportSet.java
@@ -25,7 +25,6 @@ import java.util.UUID;
 @AllArgsConstructor
 @EntityListeners(AuditingEntityListener.class)
 @JsonAutoDetect(fieldVisibility = JsonAutoDetect.Visibility.ANY)
-@OnDelete(action = OnDeleteAction.CASCADE)
 public class ReportSet {
     @Id
     @GeneratedValue(generator = "UUID")