Sorry for the limited options of field validation, but we don't recommend updating FormsCentral PDF forms in Acrobat. You may not be able to submit after such operations.
Is that correct?
I thought you could amend the form and add a 'submit button' to use forms central for any externally designed form.
The limitations on field design is why I am looking for another solution!
If you design a form in Acrobat and then import it into FormsCentral, then FormsCentral can add a submit button for it to be submitted. However in your case, the PDF form is produced by FormsCentral. The form will not work after modification of external editors for now. Hopefully we can solve the issues soon.
This is a real shame. I have seen very little development of formscentral of late and it is missing some (I'd argue) quite basic functions that would clearly be relatively easy to implement in both PDF and online forms.
Is there another Adobe supported workflow method that would allow for both PDF and online submissions?
What I may have to do now is create two forms: one for PDF (with added submit button) as this allows for field validation (a must nowadays) and use another form with limited validation for online submissions - then append the two submission databases.
This feels painful for something that should be very simple!