Can the bean provider manipulate ejb relationships at run time.. if so, how ?? Yes of course. As an example, let's say you have two entity beans, Customer and BankAccount which have the following relationship:
Customer 1 <-----------------> * BankAccount
One Customer can have 0 or many BankAccount for which he is the sole owner. At some point the customer may decide to create a new bank account for some reason.
Basically, invoking customerBeanLocal.addBankAccount(someNewBankAccountLocal) would do the job.
Also, what does it mean by saying "CMR can only exists among entity beans with the same LOCAL RELATIONSHIP SCOPE " It means that the entity beans that share relationships together must provide a local component interface and must have been deployed in the same EJB container on the same physical server.