hibernate 与 Oracle 触发器 疑惑

本人对表Customerproject设置个insert 行级 触发器create or replace trigger biud_BM_Customer_project
      after INSERT  on BM_CUSTOMER_PROJECT
      for each row
DECLARE
  r_newid NUMBER;
begin
  case
    when INSERTING then
      select S_BM_RETURNVISIT.NEXTVAL into r_newid from DUAL;
      INSERT into BM_RETURNVISIT
        (BM_RETURNVISIT.CUSTOMER_ID,
         PROJECT_ID,
         RETURN_VISIT_TIME,
         ISEXIST,
         VISITED_MAN,
         PHONE,
         POSITION,
         ID)
      values
        (:new.CUSTOMER_ID,
         :new.PROJECT_ID,
         '0001-01-01',
         0,
         '无',
         '无',
         '无',
         r_newid);
  end case;
end;
 但是，在Customer表的hibernate配置中 有这样的配置
<bag name="custProjList" table="S_BM_CUSTOMER_PROJECT"
inverse="true" cascade="save-update" lazy="false">
<key column="CUSTOMER_ID" />
<one-to-many
class="com.oarage.crm.business.entity.CustomerProject" />
</bag>
导致每次Customer 进行更新的时候 一样触发
请问 在hibernate的 配置中执行了怎样的操作导致 触发器被触发这个问题怎么解决？