Content Items Sorting based on picklist property fails

Content Server 6.0
We have developed a custom presentation template to display a list of all the work items. While displaying the work items, I would like to sort them based on a property and then filter them based on another property. I have a template code similar to below:
<pcs:foreach var="item" expr="filter(sort(sort(index.folder, 'item.pcs_id', true), 'item.application', true), '(filtered.workflow_status != "Completed")')">
The content item has two properties: application - a picklist, and workflow_status - a picklist.
The above code template does not return any results. However if I change the expression so that I am sorting by a text property, then it displays the results correctly.
For e.g,
<pcs:foreach var="item" expr="filter(sort(sort(index.folder, 'item.pcs_id', true), 'item.name', true), '(filtered.workflow_status != "Completed")')">
(name is a text property of the content item).
Is there another way of accesing a picklist property in sort function to retrieve the desired results? Can somebody point out what am I doing wrong?
Thanks for your help in advance.
Thanks
Jignesh.

Not currently. We're considering this for a future release.
Regards,
Jerry
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