Have you defined an Web Dynpro Launch System, eg. SAP_WebDynpro_XSS?
http://help.sap.com/erp2005_ehp_06/helpdata/en/43/bb2618d43a2ec5e10000000a11466f/frameset.htm
Have you defined an Web Dynpro Launch System, eg. SAP_WebDynpro_XSS?
http://help.sap.com/erp2005_ehp_06/helpdata/en/43/bb2618d43a2ec5e10000000a11466f/frameset.htm