There are many-many relationship with two CMP enitiy bean. I want to mapping their relationship into another table. For example, Users and Roles in system is many-many relationship. The table "t_userrole" with 'userId' and 'roleId' fields records the relationship between user and role. UserBean has a cmr field named 'roles'; RoleBean has a cmr field named 'users'; But I don't know how to mapping these cmr fields into t_userrole talbe. Thx.