Please ensure that you have created a communication arrangement for the web service that you would like to consume.
You can test the webservices using any 3rd party tools like SOAP UI
Also ensure that the Request parameters are set properly as explained in the help document
http://help.sap.com/saphelp_byd1505/en/PUBLISHING/IntegrationServices.html
If it still persists, please elaborate on the issue that you encountered.