When you click the remove link in a report for OneToManyComponent, the element is removed from the report but is still in the memory. Here are steps to reproduce : Open : http://localhost:8080/seaside/examplebrowser Click Edit In 'Phone numbers' click Add Put values inside fields and Save Give a first name and a last name Save the form Remove the phone number Click Edit In 'Phone numbers' click Add Put values inside fields and Save The two phone numbers are displayed even if we removed one.