I have invoked an SAP web service from adobe form.(Using WSDL data connection).
I need to send the SAP user id and password through the adobe form to the web service call so that it is authenticated and the web service call is made successfully.
Most of the posters here are users like yourself. You can "Ask an Expert" on the Acrobat User Community site, AUC, located under the "How to Tab:, http://www.acrobatusers.com/ .
Or Stefan Cameron on Forms, http://forms.stefcameron.com/ . Stefan is an employee of Adobe and he has an unofficial blog about LiveCycle Designer with many excellent examples and explanations.