Problem in BPEL Human task

I am developing the BPEL process in jdeveloper11g. I used Human task for serial approvers.
When I test the service I was able to see the Recive and Callback of human task.
I want to Invoke partner link (used for DB adapter) whenever first approval approves the task . So that I can update the status of current approval as approved ( second approval status should be Pending), after approving from second approver only the second approver status should be updated as approved.
but the procedure of updating status i.e.. Invoking partner link is executed after approved by all approvals.
Please let me what I am missing.
Thanks in advance.
Sandeep.

I am using Invoke activity to retrive data from data adapter . After that I am using While activity to iterate from the retrived data. And in While activity I placed Assign activity along with Invoke Activity to update retrived data.
but here insted of iterating from each record it goes infinite loop.
I have given "true () " as expression for While activity.
please let me where I am missing. Please its very urgent.
Thank you.

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