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No concurrent calls on stateful beans exception

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I use JBoss 3.2.1.
I have Web-Clients that create and access a stateful session bean. Now, when two instances of the Web-Clients access their corresponding session bean at exactly the same time, one of the two (the first caller) receives a "No concurrent calls on stateful beans" exception.
I understand that I can not access the *same* stateful bean concurrently, but in my case, I access different instances of the stateful bean. Why do I get this exception, and how can I prevent this?
Ranch Hand
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Do you create two instances of the session bean by calling the home interface's create() method twice like this:
MyBeanHome beanHome = MyBeanUtil.getHome(); // fyi xdoclet generated util
MyBean bean1 = managerHome.create();
MyBean bean2 = managerHome.create();
And then in two different threads you invoke bean1.dostuff() and bean2.dostuff ? Or do you call the same instance twice (bean1.dostuff() and bean1.dostuff())?
Raymond Marfurt
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I have bean1 and bean2.
When I print out an instance variable of each bean, their values are different, so I really get two different instances with home.create().
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