When using a restful webservice there is the option to "hook" in and get the raw body for further processing. This is pretty helpful to "polish" data and create workarrounds for some "import mapping challenges". Unfortunatly this option is not available for "common" webservices (SOAP).
It would make things less worse sometimes, if there is an option to bypass the response body into a string, instead of processing it with an export mapping for (SOAP) webservices.
Fun fact: It is possible to use a custom Request Body as XML data.
PS: I'm aware, that this can be achieved by building the full request for SOAP manually and then using a REST call (POST). The extra effort to do this may be a bad exchange in comparison to the time you win.