Problem using passivateStateForUndo when having taskflow requires-transacti

HI All,
i'm trying to use oracle.jbo.server.ApplicationModuleImpl.passivateStateForUndo / activateStateForUndo methods to make and restore some application savepoints.
The problem is that, when i try to use these methods from adf bounded taskflow, (placed on a page as a region ) i receive:
java.lang.NullPointerException
at oracle.jbo.server.ApplicationModuleImpl.passivateStateForUndo method
I made some investigation of the problem and founded that this NullPointerException is caused by taskflow transaction settings "requires-transaction"
If i put the taskflow transaction setting on default , no exception is thrown and passivateStateForUndo / activateStateForUndo methods worked fine.
Is that a bug, and does somebody have an idea how can i solve this ?
I work with TP4.
Regards,
Krasimir

Hi,
why don't you use the declarative save-point feature in taskflows as described in chapter 18 of the documentation ?
"If you want changes the user made within the called ADF bounded task flow to be discarded when it is exited, you can specify the restore-save-point option on the task flow return activity. The ADF Controller will roll back to the previous ADF Model save point that was created when the ADF bounded task flow was entered. The restore-save-point option applies only to cases when an ADF bounded task flow is entered by joining an existing transaction (either the requires-existing-transaction or requires-transaction option is also specified) and a Save Point is created upon entry."
Frank

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+1. Considering my application design (i.e. consuming Shared AM instance from inside the task-flow which are desinged to be opened with new transaction/isolated datacontrol), will I get benefitted in any way If i use Shared AM. If so, what are all the possible type of usages of shared AM for my design?+
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