Well, excuse me for my English, as well as for the intervention.
If you use some JavaScript in your pages, you can also avoid posting twice, by replacing the submit button with another button and a JS function that does what you need before posting, open a popup with the information of your form, if OK, you call form.submit, otherwise you get back to the form (nothing to do, or maybe a focus on the right place).
I hope it will help, even if I don't give technical details.
A++
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