Would anyone please have an example of how to use the WriteSOAPBodyMethod method?

The webservice method I'm trying to overwrite the body looks like this:

Method RecepcionarLoteRps(EnviarLoteRpsEnvio As %String(CONTENT="MIXED")) As %String(CONTENT="MIXED",XMLNAME="EnviarLoteRpsResposta") [ Final, ProcedureBlock = 1, SoapBindingStyle = document, SoapBodyUse = literal, WebMethod ]
{
 Set ..WriteSOAPBodyMethod = "override"
 Quit ..WebMethod("RecepcionarLoteRps").Invoke($this,"",.EnviarLoteRpsEnvio)
 Set ..WriteSOAPBodyMethod=""
}
Method override(proxy As