Write XML in a context field

Good morning forum

Have to implement the following solution.

In a Web Dynpro component I am consuming a web service, and reading an XML, it is now functioning properly.

But after the XML data is loaded into context, I must record all xml content in a context field.

I implemented the following logic:

Request_ITF_O_S_CONSULTA_CADASTRO requestMO = wdContext.currentRequestWSElement () modelObject (.);

requestMO.wdSetInvocationLogEnabled (true);

String xml = requestMO.wdGetResponseLog ();

However the variable "XML" is blank.

Does anyone have any tips on how to do this?