prevent duplicate orders

I am resubmitting this because it was not solved, and it’s not clear to me whether it will get followup based on my "answer" in the original thread:

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I'm getting duplicate orders.

See link below to Google sheet integration.

The form URL: jotformpro.com/stpks/hapng

In cols d & e on the 16th and again the 18th of August we have TAL & ENGLISH

It seems that reloading the browser page with the Thank You displayed resends the order with a different submission ID.

Unfortunately, as a result we produced the same personalized item twice.

Help!

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Welvin's reply:

But when your customer clicks the back button and re-submit the form, that will create a duplicate order. You should advise them not to do so. You can create an autoresponder email: http://www.jotform.com/help/26-Creating-a-Form-Autoresponder or simply put a message in the thank you page.

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i understand your answer, but it does not solve our problem.

The agent in the field is using a smartphone to take orders and we cannot rely on the added routine of checking emails after each order and before the next order. Only a warning in real time would -possibly - achieve results. Furthermore, the autoreply only informs that an order has been recorded, but does not catch duplicates: it neither informs of them, nor flags or prevents them

Advising the user not to press the back button is not a foolproof solution, because it requires the user to remember the advisory at all times... even in the heat of selling.

Please help.

I understand that the info is resent because it remains in the browser's cache - can that be flushed clean when the thank you page is displayed?

Can I be informed in one of the reports or integrations that two submissions are identical except for the unique submission ID?

This needs more thought and more work. Please help.

I have replied to your original thread 30 minutes ago. Please kindly check. Here's the link: https://www.jotform.com/answers/643979#644664

Thanks