Hi
I faced this issue in case of SAP portal not nwbc where in it comes as a separate workitem.
Refer : http://help.sap.com/saphelp_nw2004s/helpdata/en/7a/df014b037141ca9afc6433ed42b519/content.htm
Re: UWL - Retrieve Rejection text entered via UserDecisionNote
regards
Vaibhav