How to not update the model value whe, multiple back-end validation failed

Hello !
I have a save button who perform in backend code multiple validations on some fields. The validations can be ok, if not, I show specific error messages in my page. It's working fine.
The problem is that all the InputText I need to valid are value binded with value=#{backing.somepropery} to the model and when the code of the ActionEvent is called the model was already update.
So the validation is useless, you see error message ok but I can't prevent action to be done.
As the validation occurs only when I press a specific button I can't use custom validator.
does someone have an idea to manage that ?
Thank You.
Dan.

Thnaks for your repsonse but, it"s not working because the values are bound so the modifications are already done.
I'm sure that there is a way to do that.

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=========================================================
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[ethernet]
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How to not update the model value whe, multiple back-end validation failed

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