What I did is create the new document in a dialog box (I use the one from the extension Library. The user composes the new document then clicks submit. In the submit button. after doing all the checking etc take the dialog down. That should isolate the validation to just the dialog (but I have not tried that explicitly) should isolate the document that you are creating to the dialog. Frankly I have not been able to get validation to work very well so that it only validates when the document is saved. In native Notes I tended to do all that validation in the QuerySave Event and found that, for me, that works better. I then return the the results in a viewScope errorMessage and display it if the save fails. There appear to be issues with the sequence of the validation messages (they don't appear in the same order as the fields are on the page) so by doing it all in the QuerySave I can control that plus if you have a a fair bit of logic in your validation I find it easier to maintain because it is all in one place. Others might disagree, but I have not seen a good answer. 

On another point I'm not sure how you are keeping the documents related I do it by creating a field in the main document (I call it LinkKey) and set it to @Unique() then store that value if each of the 'responses'. I used to use the parent UNID but that generates all manner of problems if a save/rep conflict every happens, or if you wish to archive documents because the UNID changes. 

Hi Bill,

Thanks for the suggestion, but am trying to keep the design as flat as possible. Popups aren't that great on mobiles. For the moment, I've created another page, with a link below the review, to write user reviews.

Am linking by parent docID, but using a field storing the docID that is computed when composed, so never changes (have had this on every form I've designed in Notes for years).  This works fine for archived documents, as the field itself is the key, not using a formula like @text(@documentUniqueID), and doing lookups (also excluding rep/save conflicts) to a view sorted by this field.