Export to Excel functionality doesn't work when DataControlScope is shared.

Hi All,
I have a taskflow whose transaction setting is as Below:
1.Always Begin New Transaction
2.DataControlScope is isolated(Share data controls with calling task flow checkbox is unchecked).
I have an Export to Excel functionality with exportCollectionActionListener.The jsff source snippet is given below.
<af:commandMenuItem text="#{smviewcontrollerBundle.EXPORT_TO_EXCEL}"
id="cmi1" icon="/images/excel_icon.jpg"
binding="#{backingBeanScope.backing_fragments_RefSetSearch.cmi1}">
<af:exportCollectionActionListener exportedId="resId1"
type="excelHTML"
filename="SmRefSetCodes"
title="System Reference Inquiry Result"/>
</af:commandMenuItem>
The jsff is used in the above mentioned task-flow.Having this configuration in task-flow,export to excel doesn't export any table data in the excel sheet.But the moment,data-control-scope is changed to shared,export starts working.
Is there any specific reason on this kind of behavior.
In all other task-flows in my application,I have data-control-scope as isolated only,but there,export is working perfectly fine.
Please help.
Thanks,
Gaurav

Hi Frank,
Thanks for your reply.
Exactly,I have just one task-flow in which I have a page fragment for which export to excel is not working.The moment I change the data-control-scope to shared,export functionality starts working.
I do have correct table id mentioned in exportCollectionListener.
Is there anything I need to look into?
Thanks,
Gaurav.

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