APEX calling SAP Adapter Web service

Question

Scenario:
APEX 3 referencing web service exposed using OAS SAP Adapter.
WSDL consumed OK by APEX at design time.
At runtime user gets parameter form generated by APEX as expected.
User enters what are believed to be correct parameter values and gets error "... [service] value missing or null value supplied ..."
Question:
Is there any way inside APEX to capture a log of the SOAP/XML message generated by APEX to validate that it is correctly formed?

Answer 1

user646124:
If you click on Shared Components => Web Services References, change the View select list to Details and click the Go button, you will see a test icon. You can supply the parameters and see the envelope that is sent and the response from the service.
If you find that the envelope is malformed, you can use the manual Web references feature (which was designed for cases like this) described at the following links:
http://download.oracle.com/docs/cd/E10513_01/doc/appdev.310/e10499/advnc.htm#BABCBBHJ (see Creating a Web Reference Manually)
http://download.oracle.com/docs/cd/E10513_01/doc/appdev.310/e10497/web_serv.htm#CHDEFEGH
I use a free tool at soapui.org to build SOAP Envelopes based on a WSDL.
Finally, if Manual Web references won't work for you, you might want to check out this blog entry which contains code for a flexible Web service API, which allows you to call a Web service anywhere you can write PL/SQL in Application Express, and then store the response in a collection. It has a utility function to pull specific values based on xPath references:
http://jastraub.blogspot.com/2008/06/flexible-web-service-api.html
Regards,
Jason