diff --git a/src/main/java/com/example/demo/app/infra/entity/AllocationEntity.java b/src/main/java/com/example/demo/app/infra/entity/AllocationEntity.java
index 2598748..bd15a2c 100644
--- a/src/main/java/com/example/demo/app/infra/entity/AllocationEntity.java
+++ b/src/main/java/com/example/demo/app/infra/entity/AllocationEntity.java
@@ -6,6 +6,7 @@ import jakarta.persistence.Column;
 import jakarta.persistence.Entity;
 import jakarta.persistence.FetchType;
 import jakarta.persistence.Id;
+import jakarta.persistence.IdClass;
 import jakarta.persistence.JoinColumn;
 import jakarta.persistence.ManyToOne;
 import jakarta.persistence.OneToOne;
@@ -18,6 +19,7 @@ import lombok.Data;
 import lombok.NoArgsConstructor;
 
 @Entity
+@IdClass(AllocationId.class)
 @Table(name = "allocation_m")
 @Data
 @NoArgsConstructor
diff --git a/src/main/java/com/example/demo/app/infra/repository/AllocationRepository.java b/src/main/java/com/example/demo/app/infra/repository/AllocationRepository.java
index 8817122..56913d8 100644
--- a/src/main/java/com/example/demo/app/infra/repository/AllocationRepository.java
+++ b/src/main/java/com/example/demo/app/infra/repository/AllocationRepository.java
@@ -7,10 +7,11 @@ import org.springframework.data.jpa.repository.Query;
 
 import com.example.demo.app.domain.model.CourseInfoModel;
 import com.example.demo.app.infra.entity.AllocationEntity;
+import com.example.demo.app.infra.entity.AllocationId;
 
-public interface AllocationRepository extends JpaRepository<AllocationEntity, Long>{
+public interface AllocationRepository extends JpaRepository<AllocationEntity, AllocationId>{
 	
-	List<AllocationEntity> findByCourseId(Long courseId);
+	List<AllocationEntity> findByCourseEntity_CourseId(Long courseId);
 	
 	@Query(" SELECT co.course_id, "
 			+ " co.course_name, "