documentToXMLString service error when doing a SOAP request

I’m using the following service, pub.xml:documentToXMLString, and get the following, java.lang.Exception: missing required parameter ‘document’, error when doing a SOAP request. But I don’t get the same error when I manually step thru the pipeline.
Please help

Have the pipeline saved just before the failing service(docToXML) and RUN the service, NOT step thru. Then retrieve the pipeline and check whether you are getting any response after doing the HTTP request which I assume that is what you are trying to convert.

running the wM package from the saved pipeline seems to be fine… the problem occurs when doing a soap request outside wM.