Out in the box Form Approval in Magento

Say you want to modify one of many validation rules, the best way would be to create a method which has a same name in addition to load it following the original method. This way, all calls would be redirected to your method instead of the original. Just be watchful if you’re overriding validation rules like this, because javascript is client-side validation. You may include your server confirm the field likewise - which could potentially cause some errors though the value within field was entered the way you wanted.

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