We did some more testing with this, and it looks like if you set the invoke button to run "Server Side", then the form will be able to call a web service WITHOUT being reader enabled.
There is still a problem doing that within workspace but that might be a problem with workspace and not the way the technology is supposed to work.
Sorry for the confusion.
A fix was made in SP2 to support server-side web service calls in Workspace.
yes, thank you both. I got the fix from Adobe Tech Support last week. It's working.
The fix I got included a rather complex looking "Submit Service" though. Makes me wonder how a regular user would know that he needs to write such a Submit Service?? and even if he knows that he needs a special Submit Service, would he know how to write it??? I found no documentation for this type of things either.
Shouldn't this solution be published somewhere in Adobe's website? Dev Lab perhaps?
Would it be possible for you to post the solution here.
sorry about late response. I don't think I can post the solution here, I can't attach the files. But if you give me your email address, I can send it to you.
There are 3 parts to this solution:
(1) you will need the SP2 patch
(2) your XDP form needs to have things done in certain way