Completion of workitem for webdynpro abap application

Hello,

i start a webdynpro abap application from a workitem with BO WEBSERVICE, method PROCESSDIALOG. Terminating event is COMPLETED from BO WEBSERVICE.

After i complete the workitem with FM SAP_WAPI_WORKITEM_COMPLETE in the webdynro application, workitem is processed, but workflow is set to error.

thanks

paul