Invoke Method 2

So I have used the Web Services Wizard to create a project for integrating with SharePoint ASMX Web Services.
A method provided by the web services (amongst many) is UpdateList which requires parameters to be passed in as an XML node, however, when I pass the well-formed XML to the generated flow, it appears the Invoke Method 2 operation is escaping characeters, therefore making the request invalid. (For example, the < character is replaced with &lt;) An extracte from the raw XMLRequest demonstrating this is:
        

<soap1:newFields>&lt;Fields&gt;
&lt;Method ID="1"&gt;
&lt;Field Type="Text" DisplayName="CoManaged" FromBaseType="TRUE" /&gt;
&lt;/Method&gt;
&lt;/Fields&gt;</soap1:newFields>

Is there any way to adjust this behaviour and stop Invoke Method 2 escaping my input?