Appserver memory leak - Cleaning up an input parameter datas

I have a procedure that is causing a memory leak on a state-free appserver, but only when called from a webservices client.

This is an example of the code that is generating the leak:

def temp-table ttTest no-undo
    field myfield as char
    .
def dataset dsTest for ttTest.

define input parameter dataset for dsTest.
define output parameter pc-result as character.

pc-result = "hello".

Details of the leak are (the LONGCHAR/MEMPTR is never cleaned up):

DYNOBJECTS Allocated   LONGCHAR/MEMPTR 0x136ca80 size: 282 ( @ 0) 
DYNOBJECTS Created        X-DOCUMENT              Handle:1457 (libapp/online/web-datasettest.p @ 0) IMPLICIT  Pool:<Session Pool>
DYNOBJECTS Deleted        X-DOCUMENT              Handle:1457 (libapp/online/web-datasettest.p @ 0) IMPLICIT 

The dynamic objects are only generated when call the procedure over webservices:

...connect to webservice....
RUN webdatasettest in lh-webprocedure (
            input dataset dsTest, 
            output lc-result,  
            output lc-output) no-error.
message lc-output view-as alert-box

However if I call the procedure as follows, none of the dynamic objects are created:

create server hServer.
hServer:connect("-AppService myappserver -H myhost -sessionModel Session-Free").
    
RUN libapp/online/web-datasettest on hServer (
        input dataset dsTest, 
        output lc-output).

hServer:disconnect().
message lc-output view-as alert-box.

I know it has something to do with the dataset, but I am at a loss to figure out what!  I have tried cleaning it up by adding a widget pool, deleting the dataset object but with no luck as yet.  The allocation happens before any of the code is executed (have put messages in to figure this one out).  I am using the WSA with Tomcat 6.29.

Can anyone shed any light?

Chris

10.2b02, Solaris 10 64bit.