add合作单位导入

edu-user/edu-user-biz/src/main/java/com/keao/edu/user/service/impl/ExamRegistrationServiceImpl.java

@@ -93,7 +93,7 @@ public class ExamRegistrationServiceImpl extends BaseServiceImpl<Long, ExamRegis
             }
             level = examSubjectSong.getLevel();
             registrationFee = examSubjectSong.getRegistrationFee();
-            amount.add(registrationFee);
+            amount = amount.add(registrationFee);
         }
 
         if (examRegistration.getOrganId() == null) {