PCOLL_CONTROL, PCST_TXN,...What are these objects? JBO-28039:Root node for collection

I've a UIX JSP Application with BC4J developed with JDeveloper RC.
I noted that in my schema there are these "strange" db objects:
PCOLL_CONTROL
PCST_MYPACKAGEMODULE_SEQ
PCST_MyPackageModule
PCST_TXN
PCST_TXN_SEQ
Can anyone explain what are they or where can I find documentation about them ?
When and why Jdev create them ?
Beside some people that use my application got the following Error:
"JBO-28039: Root node for collection TXN of id -1 is invalid......".
I think that it's connected with the objects listed above.
Has someone experienced this problem ?
thank you
Isabella

Could you provide more information regarding this issue:
1. When you mention that some people that use your application receive the exception do you mean that the
exception is thrown from the application and displayed to the user or do you mean that the exception is simply logged
in the Diagnostic output? The latter may be expected in some scenarios.
2. Could you provide a full stack trace for the exception?
3. Could you provide the BC4J diagnostic output generated when the exception occurs (specify the VM switch
-Djbo.debugoutput=console at the command line)?
Thanks,
JR

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