Jboss 3.0.2 with Oracle 8.1.7 and CMP 2.0

Somehow removing an Entity Bean does work on the database but not with JBoss.

A small test client I wrote creates a new Entity Bean, searches for it and removes it.

With Oracle everything is ok, the record is removed from the database.

When I start the client again with the same data, JBoss says that the bean already exists and throws an exception.

After stopping and starting JBoss the program works perfectly again (again same data).

Am I doing something wrong with the configuration of JBoss ? The same program works fine with WebLogic.