How to Return a value to a 10g Oracle Form form a Web Service Call

I've read the demo available from Oracle, 'Calling a Web service from Oracle Forms', that shows how to invoke a call to a Web Service from a Form. The demo only shows how to do a call and how to display messages. I've done some searching, but can't seem to find any examples of how to return a value from the call into a field on the form. If any one could provide an example of that, I would greatly appreciate it.
We are in the process of modifing a form and we would like to use a webservice, which we have never done before. We have created a webservice which calculates a value based upon what is entered on the form and we want to pass that calculated value back to a field on the form.
This is the code provided by the demo to do a call.
DECLARE
jo ora_java.jobject;
xo ora_java.jobject;
rv varchar2(100);
ex ora_java.jobject;
BEGIN
JO := SendServiceSoapClient.new;
RV := SendServiceSoapClient.sendMessage(JO,:BLOCK3.PHONE_NUMBER, :BLOCK3.MESSAGE_BODY, xo, xo);
EXCEPTION
WHEN ORA_JAVA.JAVA_ERROR then
message('Unable to call out to Java, ' ||ORA_JAVA.LAST_ERROR);
WHEN ORA_JAVA.EXCEPTION_THROWN then
ex := ORA_JAVA.LAST_EXCEPTION;
message(Exception_.toString(ex));
END;

In the future, please be sure to include the exact product versions you are using. In this case, also be sure to include the java versions you are using to build your java code.
http://blogs.oracle.com/shay/entry/10_commandments_for_the_otn_fo
Regarding your question, take a look at this older white paper which discusses integrating Forms with SOA.
http://www.oracle.com/technetwork/developer-tools/forms/documentation/forms-soa-wp-1-129441.pdf

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