Method ResetRelease of object BUS2012 is hanging in background

Hi,
We are using PO release Workflow, when some approver reject the PO, another workflow triggers which will reset the release strategy. But the method ResetRelease of object type BUS2012 is hanging in background, it is showing in process status, and the release strategy is not reseting. This method is using BAPI "BAPI_PO_RESET_RELEASE".
when i run this bapi using SE37, It is reseting the release strategay correctly. But in workflow It is hanging in backgourd. Not showing any error, just inprocess status.
Thanks,

Hi surjith kumar,
Thanks for your reply, It is not opened in another system, The problem only comes when I run it in background. I have made a copy of the BUS2012 and copied the RESETRELEASE method to run in foreground it is running fine if i run it in foreground through some agent. Standard method is created for background processing. but it is not getting completed, it is showing IN PROCESS status.
I don't know what is wrong, If i test the method through SWO1 it is working ok.
If i test the workflow using 'SWUS' it get hanged in background. But if i select 'Debug Mode' to "Asyncronous Execution using aRFC' in "START OPTIONS". It go well.

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