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What kind of data is returned by your callcredit webservice? Try performing a cfdump on "io".
Also, the cfinvoke/webservice method usually generates the SOAP wrapper around your webservice arguments. You may want to try just passing the XML expected by Job5314 (unless, of course, the method is expecting a full SOAP message as a parameter).
<cfinvokeargument name="io" value="#strpost2#"/>
Thanks Michael...I tried what you mentioned but I still get the same error...I think my fundemental proble is I do not understand my WSDL file very well....
If you have access to them, I would try loading the WSDL as a web reference in either .NET studio or Dreamweaver MX. From there you can inspect the webservice and see what the input and output variables for the web service functions are. Its much easier that trying to read through the WSDL document if you're not familiar with the structure of the document.
If you are still having problems with the webservice, you could always contact the 3rd party developer and see if they have any sample code showing how to consume the webservice. Odds are they probably won't have anything in CF, but it might give you more of an idea of what the methods expect and return.