How to Update HUMAN TASK Payload SOA/BPM 11G

Hi ,
I need to update the Expiration time based on the escalation level for Human task .
I trying to update the TaskExpiration time on the Java call back when onAssign activity is triggered.
Even though the execution is successful the task will not be updated with new expiration time..
Below is the code snippet
public class CallBackClass implements IRoutingSlipCallback , IDynamicTaskEscalationPattern {
    public CallBackClass() {
        super();
    public void onTaskAssigned(Task task, String string, String string1,String string2) {
        System.out.println("routing Slip: inside onTaskAssigned");
        System.out.println("Priority :" + task.getPriority());
        task.setPriority(1);
        System.out.println("TaskID :" + task.getSystemAttributes().getTaskId());
        task.setPriority(1);
        System.out.println("Updated Priority :" + task.getPriority());
        getTaskEscalationUser(task);
        System.out.println("Executed getTaskEscalationUser");
       WorkflowUtil.getRoutingSlip(task.getSystemAttributes().getTaskId()).getGlobalConfiguration().getExpirationDuration().setDuration("PT3M");
Please update your suggestion or suggest some API which van help me in fixing this task.
Thanks in advance !!

Hi:
Take a look at this post: http://beatechnologies.wordpress.com/2011/08/24/
Also here is the Oracle Doc: http://docs.oracle.com/cd/E12839_01/apirefs.1111/e10660/oracle/bpel/services/workflow/query/ITaskQueryService.html
and:
http://docs.oracle.com/cd/E17904_01/integration.1111/e10224/bp_worklistcust.htm#BHAHBHID
Hope this helps.
best
rolando

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import java.util.Map;
import oracle.bpel.services.workflow.assignment.dynamic.DynamicAssignmentException;
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We need to auidt all changes in a task payload ?
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is bpel have these information.
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if it hasn't how we can implemet a solution ?
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We need to auidt all changes in a task payload ?
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Http://orasoa.blogspot.com

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How to Update HUMAN TASK Payload SOA/BPM 11G

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