Sorting field in rtf template does not display data

Hi,

I have the following code:
<?for-each: OutboundPayment?>
<?Payee/Name?>

i tried to use this to sort the Name
<?sort:Payee/Name?>
 and this also
<?sort:Payee/Name;'ascending';data-type='text'?>


but the result does not display the data in the Name field.
But not for all OutboundPayment nodes,for some it dispays,for some it doesn't. Haven't figured out the criteria why others get displayed and others dont.

-phil