Were you able to figure this out? I am having a similar problem. I have noticed that if i use the submit button in the status bar IWP will generate an error message. However if try to submit the record using my own submit button (a script with Commit Records/Requests) then I don't get the same error message. Not sure how my submit button is different from the submit button in the status bar. Don't know if I need to create a script that will return an error message.