How can I pass xml in payload via retrofit

Question

I'm using retrofit 1.9 and SimpleXMLConverter. I try to send request to server with payload as XML.

@POST("/M/Bean?wsdl")
        Observable<MainNode> getObject(@Body MyObject object);

I have this xml as string

 String payload = "<SOAP-ENV:Envelope xmlns:SOAP-ENV> MY_OBJECTS</SOAP-ENV:Envelope>";

retrofit.getObject(payload)

and in logs from retrofit I see

D/Retrofit: <string>&lt;SOAP-ENV:Envelope MY_OBJECTS SOAP-ENV:Envelope&gt;</string>

How can I pass full XML payload without <string>?