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Once your form is in use, your users have submitted the form a few times and Confluence pages have been created from those submissions, you must be careful when making edits to the form. If you make incompatible changes to the form - essentially, if you change the structure of the form in such a way that it is incompatible with the original structure - your users may not be able to Edit their existing Confluence pages using the form. That's because the Edit Confluence page functionality relies on initializing the form with the XML document generated by . Please read the above-mentioned Section on XML Documents that generates carefully before you edit your forms.
When you edit a form/flow for which form action is setup as create/update or merge, the message shown in the image will display as a warning in the designer.
