Using Flex Fields in BPM worklist

Hi,
Am trying to use flexfileds in BPM worklist so that I can have additional attributes from the payload associated from the humantask type , in the task header that appears in home page.
Am able to create new label and then tried following steps :-
1. Clicked Edit mappings by task type and selected my task type whose payload attributes are required to be mapped with the flex fields.
2. The value "default/sampleta!1.0*soa_b4396581-d005-4374-be29-5cd725c3e134/Humantask" gets populated in the fields "Edit mappings by task type".
3. However , it shows the message "There are no simple Payload Attributes associated with this TaskType".
I thought that I need to make use of Mapped Attributes section in the Data tab found in humanworkflow task . However when I tried adding attribute there it showed me following error message :-
Error in workflow service Web service operation invocation.
Error in workflow service Web service operation invocation. The error is ORA-30501:Error in authenticating user.
Error in authenticating and creating a workflow context for user jazn.com/dev_soa_admin.
Verify that the user credentials and identity service configurations are correct.
Verify that the SOAP connection information for the server is correct.
     at oracle.bpel.services.workflow.query.client.TaskQueryServiceSOAPClient.convertSOAPFaultException(TaskQueryServiceSOAPClient.java:242)
     at oracle.bpel.services.workflow.query.client.TaskQueryServiceSOAPClient.invoke(TaskQueryServiceSOAPClient.java:203)
     at oracle.bpel.services.workflow.query.client.TaskQueryServiceSOAPClient.authenticate(TaskQueryServiceSOAPClient.java:253)
     at oracle.bpel.services.workflow.query.client.AbstractDOMTaskQueryServiceClient.authenticate(AbstractDOMTaskQueryServiceClient.java:167)
     at oracle.bpel.services.workflow.query.client.AbstractDOMTaskQueryServiceClient.authenticate(AbstractDOMTaskQueryServiceClient.java:185)
     at oracle.tip.tools.ide.pm.modules.humanworkflow.task.taskflow.wizard.lookup.LookupUtil.listAttributeLabels(LookupUtil.java:436)
     at oracle.tip.tools.ide.pm.modules.humanworkflow.task.taskflow.wizard.lookup.LookupUtil.listProtectedAttributeLabels(LookupUtil.java:406)
     at oracle.tip.tools.ide.pm.modules.humanworkflow.task.taskflow.wizard.lookup.LookupDataProviderImpl.handleFlex(LookupDataProviderImpl.java:105)
     at oracle.tip.tools.ide.pm.modules.humanworkflow.task.taskflow.wizard.lookup.LookupDataProviderImpl.getResult(LookupDataProviderImpl.java:38)
     at oracle.tip.tools.ide.workflow.api.FlexFieldDetailsPanel.initializeAttributeCombo(FlexFieldDetailsPanel.java:175)
     at oracle.tip.tools.ide.workflow.api.ConnectionComponent._applicationServerChanged(ConnectionComponent.java:350)
     at oracle.tip.tools.ide.workflow.api.ConnectionComponent.access$1000(ConnectionComponent.java:60)
     at oracle.tip.tools.ide.workflow.api.ConnectionComponent$1.run(ConnectionComponent.java:361)
     at java.lang.Thread.run(Thread.java:619)
ORABPEL-30044
I have couple of questions :-
1. For the payload attribute to appear in the BPM worklist sreen while mapping for the flex field , I understand that it should be of simple type . My payload looks like this :-
<ns:employees>
<ns:employee>
<ns:name>John</ns:name>
<ns:age>37</ns:initiator>
<ns:salary>20000</ns:salary>
</ns:employee>
</ns:employees>
I expected name , age , salary to appear in BPM worklist for mapping after I select task type against "Edit mappings by task type" while doing flex field mapping however it is showing me : There are no simple Payload Attributes associated with this TaskType
2. Please advise if I need to anything extra like adding mapped attributes (in Data section of Humantask) or Collections in Task parameter window .
Can anyone please help me on this .
Thanks in advance !

Are you sure the xml is correct here:
<ns:employee>
<ns:name>John</ns:name>
<ns:age>37</ns:initiator>
<ns:salary>20000</ns:salary>
</ns:employee>
It should be <ns:age>37</ns:age>, I believe.
I have a xsd definition like this:
<element name="loanApplication">
<complexType>
<sequence>
     <element name="SSN" type="string"/>
     <element name="email" type="string"/>
     <element name="customerName" type="string"/>
     <element name="customerAge" type="int"/>
     <element name="customerAnnualIncome" type="double"/>
     <element name="city" type="string"/>
     <element name="state" type="string"/>
     <element name="country" type="string"/>
     <element name="loanAmount" type="double"/>
     <element name="carMake" type="string"/>
     <element name="carModel" type="string"/>
     <element name="carYear" type="string"/>
     <element name="creditRating" type="int"/>
     <element name="creditRisk" type="string"/>
     <element name="creditMaxAmount" type="double"/>
</sequence>
</complexType>
</element>
And I am able to do the mapping without any issues.

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Using Flex Fields in BPM worklist

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