Leave request - Issue with workflow/task

I set the task TS21500003 pointing to webdynpro application in configuration (parameter also set to DYNPARAM#LRF_REQUEST_ID=${item.REQUESTID}.) and trying to re-register UWL configuration, but getting warning message "WebDynproNamespace value not found for task TS21500003 in system". Even I don't find the task in UWL configuration. I can see the workflow in SWFVISU but not in portal. MSS Add On 1.0 is also installed and also installed business function HCM_MSS_WDA_1, am I missing anything?